From 3c1f9ec2f0e284b9f4d5f66b82de4fe811995e79 Mon Sep 17 00:00:00 2001
From: Manvith <148960168+manvith2003@users.noreply.github.com>
Date: Tue, 17 Dec 2024 20:29:40 +0530
Subject: [PATCH 1/6] feat: add C implementation for
 stats/base/dists/normal/skewness

---
 .../base/dists/normal/skewness/README.md      |  93 +++++++++-
 .../normal/skewness/benchmark/benchmark.js    |  14 +-
 .../skewness/benchmark/benchmark.native.js    |  70 ++++++++
 .../normal/skewness/benchmark/c/Makefile      | 146 +++++++++++++++
 .../normal/skewness/benchmark/c/benchmark.c   | 140 +++++++++++++++
 .../base/dists/normal/skewness/binding.gyp    | 170 ++++++++++++++++++
 .../dists/normal/skewness/examples/c/Makefile | 146 +++++++++++++++
 .../normal/skewness/examples/c/example.c      |  40 +++++
 .../base/dists/normal/skewness/include.gypi   |  53 ++++++
 .../stdlib/stats/base/dists/normal/skewness.h |  38 ++++
 .../base/dists/normal/skewness/lib/native.js  |  63 +++++++
 .../base/dists/normal/skewness/manifest.json  |  76 ++++++++
 .../base/dists/normal/skewness/package.json   |   3 +
 .../base/dists/normal/skewness/src/Makefile   |  70 ++++++++
 .../base/dists/normal/skewness/src/addon.c    |  23 +++
 .../base/dists/normal/skewness/src/main.c     |  58 ++++++
 .../dists/normal/skewness/test/test.native.js | 111 ++++++++++++
 17 files changed, 1308 insertions(+), 6 deletions(-)
 create mode 100644 lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/benchmark.native.js
 create mode 100644 lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/c/Makefile
 create mode 100644 lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/c/benchmark.c
 create mode 100644 lib/node_modules/@stdlib/stats/base/dists/normal/skewness/binding.gyp
 create mode 100644 lib/node_modules/@stdlib/stats/base/dists/normal/skewness/examples/c/Makefile
 create mode 100644 lib/node_modules/@stdlib/stats/base/dists/normal/skewness/examples/c/example.c
 create mode 100644 lib/node_modules/@stdlib/stats/base/dists/normal/skewness/include.gypi
 create mode 100644 lib/node_modules/@stdlib/stats/base/dists/normal/skewness/include/stdlib/stats/base/dists/normal/skewness.h
 create mode 100644 lib/node_modules/@stdlib/stats/base/dists/normal/skewness/lib/native.js
 create mode 100644 lib/node_modules/@stdlib/stats/base/dists/normal/skewness/manifest.json
 create mode 100644 lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/Makefile
 create mode 100644 lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/addon.c
 create mode 100644 lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/main.c
 create mode 100644 lib/node_modules/@stdlib/stats/base/dists/normal/skewness/test/test.native.js

diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/README.md b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/README.md
index 72091642056b..3d500076518f 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/README.md
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/README.md
@@ -128,13 +128,100 @@ for ( i = 0; i < 10; i++ ) {
 
 <!-- /.examples -->
 
-<!-- Section to include cited references. If references are included, add a horizontal rule *before* the section. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+<!-- C interface documentation. -->
 
-<section class="references">
+* * *
+
+<section class="c">
+
+## C APIs
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<!-- C usage documentation. -->
+
+<section class="usage">
+
+### Usage
+
+```c
+#include "stdlib/stats/base/dists/normal/skewness.h"
+```
+
+#### stdlib_base_dists_normal_skewness( mu, sigma )
+
+Evaluates the skewness for a normal distribution with mean `mu` and standard deviation `sigma`.
+
+```c
+double out = stdlib_base_dists_normal_skewness( 0.0, 1.0 );
+// returns 0.0
+```
+
+The function accepts the following arguments:
+
+-   **mu**: `[in] double` mean.
+-   **sigma**: `[in] double` standard deviation.
+
+```c
+double stdlib_base_dists_normal_skewness( const double mu, const double sigma );
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+</section>
+
+<!-- /.notes -->
+
+<!-- C API usage examples. -->
+
+<section class="examples">
+
+### Examples
+
+```c
+#include "stdlib/stats/base/dists/normal/skewness.h"
+#include <stdlib.h>
+#include <stdio.h>
+
+static double random_uniform( const double min, const double max ) {
+    double v = (double)rand() / ( (double)RAND_MAX + 1.0 );
+    return min + ( v*(max-min) );
+}
+
+int main( void ) {
+    double mu;
+    double sigma;
+    double y;
+    int i;
+
+    for ( i = 0; i < 10; i++ ) {
+        mu = random_uniform( -5.0, 5.0 );
+        sigma = random_uniform( 0.1, 20.0 );
+        y = stdlib_base_dists_normal_skewness( mu, sigma );
+        printf( "µ: %.4f, σ: %.4f, skew(X;µ,σ): %.4f\n", mu, sigma, y );
+    }
+}
+```
+
+</section>
+
+<!-- /.examples -->
 
 </section>
 
-<!-- /.references -->
+<!-- /.c -->
 
 <!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
 
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/benchmark.js b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/benchmark.js
index c836ff5e0ee9..4e5288f24dbe 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/benchmark.js
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/benchmark.js
@@ -21,6 +21,7 @@
 // MODULES //
 
 var bench = require( '@stdlib/bench' );
+var Float64Array = require( '@stdlib/array/float64' );
 var randu = require( '@stdlib/random/base/randu' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var EPS = require( '@stdlib/constants/float64/eps' );
@@ -32,15 +33,22 @@ var skewness = require( './../lib' );
 
 bench( pkg, function benchmark( b ) {
 	var sigma;
+	var len;
 	var mu;
 	var y;
 	var i;
 
+	len = 100;
+	mu = new Float64Array( len );
+	sigma = new Float64Array( len );
+	for ( i = 0; i < len; i++ ) {
+		mu[ i ] = ( randu() * 100.0 ) - 50.0;
+		sigma[ i ] = ( randu() * 20.0 ) + EPS;
+	}
+
 	b.tic();
 	for ( i = 0; i < b.iterations; i++ ) {
-		mu = ( randu()*100.0 ) - 50.0;
-		sigma = ( randu()*20.0 ) + EPS;
-		y = skewness( mu, sigma );
+		y = skewness( mu[ i % len ], sigma[ i % len ] );
 		if ( isnan( y ) ) {
 			b.fail( 'should not return NaN' );
 		}
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/benchmark.native.js b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/benchmark.native.js
new file mode 100644
index 000000000000..e437d55d195f
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/benchmark.native.js
@@ -0,0 +1,70 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var resolve = require( 'path' ).resolve;
+var bench = require( '@stdlib/bench' );
+var Float64Array = require( '@stdlib/array/float64' );
+var randu = require( '@stdlib/random/base/randu' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var tryRequire = require( '@stdlib/utils/try-require' );
+var EPS = require( '@stdlib/constants/float64/eps' );
+var pkg = require( './../package.json' ).name;
+
+
+// VARIABLES //
+
+var skewness = tryRequire( resolve( __dirname, './../lib/native.js' ) );
+var opts = {
+	'skip': ( skewness instanceof Error )
+};
+
+
+// MAIN //
+
+bench( pkg+'::native', opts, function benchmark( b ) {
+	var sigma;
+	var len;
+	var mu;
+	var y;
+	var i;
+
+	len = 100;
+	mu = new Float64Array( len );
+	sigma = new Float64Array( len );
+	for ( i = 0; i < len; i++ ) {
+		mu[ i ] = ( randu() * 100.0 ) - 50.0;
+		sigma[ i ] = ( randu() * 20.0 ) + EPS;
+	}
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		y = skewness( mu[ i % len ], sigma[ i % len ] );
+		if ( isnan( y ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+	b.toc();
+	if ( isnan( y ) ) {
+		b.fail( 'should not return NaN' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/c/Makefile b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/c/Makefile
new file mode 100644
index 000000000000..f69e9da2b4d3
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/c/Makefile
@@ -0,0 +1,146 @@
+#/
+# @license Apache-2.0
+#
+# Copyright (c) 2024 The Stdlib Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#/
+
+# VARIABLES #
+
+ifndef VERBOSE
+	QUIET := @
+else
+	QUIET :=
+endif
+
+# Determine the OS ([1][1], [2][2]).
+#
+# [1]: https://en.wikipedia.org/wiki/Uname#Examples
+# [2]: http://stackoverflow.com/a/27776822/2225624
+OS ?= $(shell uname)
+ifneq (, $(findstring MINGW,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring MSYS,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring CYGWIN,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring Windows_NT,$(OS)))
+	OS := WINNT
+endif
+endif
+endif
+endif
+
+# Define the program used for compiling C source files:
+ifdef C_COMPILER
+	CC := $(C_COMPILER)
+else
+	CC := gcc
+endif
+
+# Define the command-line options when compiling C files:
+CFLAGS ?= \
+	-std=c99 \
+	-O3 \
+	-Wall \
+	-pedantic
+
+# Determine whether to generate position independent code ([1][1], [2][2]).
+#
+# [1]: https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html#Code-Gen-Options
+# [2]: http://stackoverflow.com/questions/5311515/gcc-fpic-option
+ifeq ($(OS), WINNT)
+	fPIC ?=
+else
+	fPIC ?= -fPIC
+endif
+
+# List of includes (e.g., `-I /foo/bar -I /beep/boop/include`):
+INCLUDE ?=
+
+# List of source files:
+SOURCE_FILES ?=
+
+# List of libraries (e.g., `-lopenblas -lpthread`):
+LIBRARIES ?=
+
+# List of library paths (e.g., `-L /foo/bar -L /beep/boop`):
+LIBPATH ?=
+
+# List of C targets:
+c_targets := benchmark.out
+
+
+# RULES #
+
+#/
+# Compiles source files.
+#
+# @param {string} [C_COMPILER] - C compiler (e.g., `gcc`)
+# @param {string} [CFLAGS] - C compiler options
+# @param {(string|void)} [fPIC] - compiler flag determining whether to generate position independent code (e.g., `-fPIC`)
+# @param {string} [INCLUDE] - list of includes (e.g., `-I /foo/bar -I /beep/boop/include`)
+# @param {string} [SOURCE_FILES] - list of source files
+# @param {string} [LIBPATH] - list of library paths (e.g., `-L /foo/bar -L /beep/boop`)
+# @param {string} [LIBRARIES] - list of libraries (e.g., `-lopenblas -lpthread`)
+#
+# @example
+# make
+#
+# @example
+# make all
+#/
+all: $(c_targets)
+
+.PHONY: all
+
+#/
+# Compiles C source files.
+#
+# @private
+# @param {string} CC - C compiler (e.g., `gcc`)
+# @param {string} CFLAGS - C compiler options
+# @param {(string|void)} fPIC - compiler flag determining whether to generate position independent code (e.g., `-fPIC`)
+# @param {string} INCLUDE - list of includes (e.g., `-I /foo/bar`)
+# @param {string} SOURCE_FILES - list of source files
+# @param {string} LIBPATH - list of library paths (e.g., `-L /foo/bar`)
+# @param {string} LIBRARIES - list of libraries (e.g., `-lopenblas`)
+#/
+$(c_targets): %.out: %.c
+	$(QUIET) $(CC) $(CFLAGS) $(fPIC) $(INCLUDE) -o $@ $(SOURCE_FILES) $< $(LIBPATH) -lm $(LIBRARIES)
+
+#/
+# Runs compiled benchmarks.
+#
+# @example
+# make run
+#/
+run: $(c_targets)
+	$(QUIET) ./$<
+
+.PHONY: run
+
+#/
+# Removes generated files.
+#
+# @example
+# make clean
+#/
+clean:
+	$(QUIET) -rm -f *.o *.out
+
+.PHONY: clean
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/c/benchmark.c b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/c/benchmark.c
new file mode 100644
index 000000000000..0cf954153418
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/c/benchmark.c
@@ -0,0 +1,140 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+#include "stdlib/stats/base/dists/normal/skewness.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include <time.h>
+#include <sys/time.h>
+
+#define NAME "normal-skewness"
+#define ITERATIONS 1000000
+#define REPEATS 3
+
+/**
+* Prints the TAP version.
+*/
+static void print_version( void ) {
+	printf( "TAP version 13\n" );
+}
+
+/**
+* Prints the TAP summary.
+*
+* @param total     total number of tests
+* @param passing   total number of passing tests
+*/
+static void print_summary( int total, int passing ) {
+	printf( "#\n" );
+	printf( "1..%d\n", total ); // TAP plan
+	printf( "# total %d\n", total );
+	printf( "# pass  %d\n", passing );
+	printf( "#\n" );
+	printf( "# ok\n" );
+}
+
+/**
+* Prints benchmarks results.
+*
+* @param elapsed   elapsed time in seconds
+*/
+static void print_results( double elapsed ) {
+	double rate = (double)ITERATIONS / elapsed;
+	printf( "  ---\n" );
+	printf( "  iterations: %d\n", ITERATIONS );
+	printf( "  elapsed: %0.9f\n", elapsed );
+	printf( "  rate: %0.9f\n", rate );
+	printf( "  ...\n" );
+}
+
+/**
+* Returns a clock time.
+*
+* @return clock time
+*/
+static double tic( void ) {
+	struct timeval now;
+	gettimeofday( &now, NULL );
+	return (double)now.tv_sec + (double)now.tv_usec/1.0e6;
+}
+
+/**
+* Generates a random number on the interval [min,max).
+*
+* @param min    minimum value (inclusive)
+* @param max    maximum value (exclusive)
+* @return       random number
+*/
+static double random_uniform( const double min, const double max ) {
+	double v = (double)rand() / ( (double)RAND_MAX + 1.0 );
+	return min + ( v*(max-min) );
+}
+
+/**
+* Runs a benchmark.
+*
+* @return elapsed time in seconds
+*/
+static double benchmark( void ) {
+	double elapsed;
+    double mu[ 100 ];
+	double sigma[ 100 ];
+	double y;
+	double t;
+	int i;
+
+	for ( i = 0; i < 100; i++ ) {
+		mu[ i ] = random_uniform( -10.0, 10.0 );
+        sigma[ i ] = random_uniform( 0.1, 10.0 );
+	}
+
+	t = tic();
+	for ( i = 0; i < ITERATIONS; i++ ) {
+		y = stdlib_base_dists_normal_skewness( mu[ i%100 ], sigma[ i%100 ] );
+		if ( y != y ) {
+			printf( "should not return NaN\n" );
+			break;
+		}
+	}
+	elapsed = tic() - t;
+	if ( y != y ) {
+		printf( "should not return NaN\n" );
+	}
+	return elapsed;
+}
+
+/**
+* Main execution sequence.
+*/
+int main( void ) {
+	double elapsed;
+	int i;
+
+	// Use the current time to seed the random number generator:
+	srand( time( NULL ) );
+
+	print_version();
+	for ( i = 0; i < REPEATS; i++ ) {
+		printf( "# c::%s\n", NAME );
+		elapsed = benchmark();
+		print_results( elapsed );
+		printf( "ok %d benchmark finished\n", i+1 );
+	}
+	print_summary( REPEATS, REPEATS );
+}
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/binding.gyp b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/binding.gyp
new file mode 100644
index 000000000000..ec3992233442
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/binding.gyp
@@ -0,0 +1,170 @@
+# @license Apache-2.0
+#
+# Copyright (c) 2024 The Stdlib Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# A `.gyp` file for building a Node.js native add-on.
+#
+# [1]: https://gyp.gsrc.io/docs/InputFormatReference.md
+# [2]: https://gyp.gsrc.io/docs/UserDocumentation.md
+{
+  # List of files to include in this file:
+  'includes': [
+    './include.gypi',
+  ],
+
+  # Define variables to be used throughout the configuration for all targets:
+  'variables': {
+    # Target name should match the add-on export name:
+    'addon_target_name%': 'addon',
+
+    # Set variables based on the host OS:
+    'conditions': [
+      [
+        'OS=="win"',
+        {
+          # Define the object file suffix:
+          'obj': 'obj',
+        },
+        {
+          # Define the object file suffix:
+          'obj': 'o',
+        }
+      ], # end condition (OS=="win")
+    ], # end conditions
+  }, # end variables
+
+  # Define compile targets:
+  'targets': [
+
+    # Target to generate an add-on:
+    {
+      # The target name should match the add-on export name:
+      'target_name': '<(addon_target_name)',
+
+      # Define dependencies:
+      'dependencies': [],
+
+      # Define directories which contain relevant include headers:
+      'include_dirs': [
+        # Local include directory:
+        '<@(include_dirs)',
+      ],
+
+      # List of source files:
+      'sources': [
+        '<@(src_files)',
+      ],
+
+      # Settings which should be applied when a target's object files are used as linker input:
+      'link_settings': {
+        # Define libraries:
+        'libraries': [
+          '<@(libraries)',
+        ],
+
+        # Define library directories:
+        'library_dirs': [
+          '<@(library_dirs)',
+        ],
+      },
+
+      # C/C++ compiler flags:
+      'cflags': [
+        # Enable commonly used warning options:
+        '-Wall',
+
+        # Aggressive optimization:
+        '-O3',
+      ],
+
+      # C specific compiler flags:
+      'cflags_c': [
+        # Specify the C standard to which a program is expected to conform:
+        '-std=c99',
+      ],
+
+      # C++ specific compiler flags:
+      'cflags_cpp': [
+        # Specify the C++ standard to which a program is expected to conform:
+        '-std=c++11',
+      ],
+
+      # Linker flags:
+      'ldflags': [],
+
+      # Apply conditions based on the host OS:
+      'conditions': [
+        [
+          'OS=="mac"',
+          {
+            # Linker flags:
+            'ldflags': [
+              '-undefined dynamic_lookup',
+              '-Wl,-no-pie',
+              '-Wl,-search_paths_first',
+            ],
+          },
+        ], # end condition (OS=="mac")
+        [
+          'OS!="win"',
+          {
+            # C/C++ flags:
+            'cflags': [
+              # Generate platform-independent code:
+              '-fPIC',
+            ],
+          },
+        ], # end condition (OS!="win")
+      ], # end conditions
+    }, # end target <(addon_target_name)
+
+    # Target to copy a generated add-on to a standard location:
+    {
+      'target_name': 'copy_addon',
+
+      # Declare that the output of this target is not linked:
+      'type': 'none',
+
+      # Define dependencies:
+      'dependencies': [
+        # Require that the add-on be generated before building this target:
+        '<(addon_target_name)',
+      ],
+
+      # Define a list of actions:
+      'actions': [
+        {
+          'action_name': 'copy_addon',
+          'message': 'Copying addon...',
+
+          # Explicitly list the inputs in the command-line invocation below:
+          'inputs': [],
+
+          # Declare the expected outputs:
+          'outputs': [
+            '<(addon_output_dir)/<(addon_target_name).node',
+          ],
+
+          # Define the command-line invocation:
+          'action': [
+            'cp',
+            '<(PRODUCT_DIR)/<(addon_target_name).node',
+            '<(addon_output_dir)/<(addon_target_name).node',
+          ],
+        },
+      ], # end actions
+    }, # end target copy_addon
+  ], # end targets
+}
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/examples/c/Makefile b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/examples/c/Makefile
new file mode 100644
index 000000000000..6aed70daf167
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/examples/c/Makefile
@@ -0,0 +1,146 @@
+#/
+# @license Apache-2.0
+#
+# Copyright (c) 2024 The Stdlib Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#/
+
+# VARIABLES #
+
+ifndef VERBOSE
+	QUIET := @
+else
+	QUIET :=
+endif
+
+# Determine the OS ([1][1], [2][2]).
+#
+# [1]: https://en.wikipedia.org/wiki/Uname#Examples
+# [2]: http://stackoverflow.com/a/27776822/2225624
+OS ?= $(shell uname)
+ifneq (, $(findstring MINGW,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring MSYS,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring CYGWIN,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring Windows_NT,$(OS)))
+	OS := WINNT
+endif
+endif
+endif
+endif
+
+# Define the program used for compiling C source files:
+ifdef C_COMPILER
+	CC := $(C_COMPILER)
+else
+	CC := gcc
+endif
+
+# Define the command-line options when compiling C files:
+CFLAGS ?= \
+	-std=c99 \
+	-O3 \
+	-Wall \
+	-pedantic
+
+# Determine whether to generate position independent code ([1][1], [2][2]).
+#
+# [1]: https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html#Code-Gen-Options
+# [2]: http://stackoverflow.com/questions/5311515/gcc-fpic-option
+ifeq ($(OS), WINNT)
+	fPIC ?=
+else
+	fPIC ?= -fPIC
+endif
+
+# List of includes (e.g., `-I /foo/bar -I /beep/boop/include`):
+INCLUDE ?=
+
+# List of source files:
+SOURCE_FILES ?=
+
+# List of libraries (e.g., `-lopenblas -lpthread`):
+LIBRARIES ?=
+
+# List of library paths (e.g., `-L /foo/bar -L /beep/boop`):
+LIBPATH ?=
+
+# List of C targets:
+c_targets := example.out
+
+
+# RULES #
+
+#/
+# Compiles source files.
+#
+# @param {string} [C_COMPILER] - C compiler (e.g., `gcc`)
+# @param {string} [CFLAGS] - C compiler options
+# @param {(string|void)} [fPIC] - compiler flag determining whether to generate position independent code (e.g., `-fPIC`)
+# @param {string} [INCLUDE] - list of includes (e.g., `-I /foo/bar -I /beep/boop/include`)
+# @param {string} [SOURCE_FILES] - list of source files
+# @param {string} [LIBPATH] - list of library paths (e.g., `-L /foo/bar -L /beep/boop`)
+# @param {string} [LIBRARIES] - list of libraries (e.g., `-lopenblas -lpthread`)
+#
+# @example
+# make
+#
+# @example
+# make all
+#/
+all: $(c_targets)
+
+.PHONY: all
+
+#/
+# Compiles C source files.
+#
+# @private
+# @param {string} CC - C compiler (e.g., `gcc`)
+# @param {string} CFLAGS - C compiler options
+# @param {(string|void)} fPIC - compiler flag determining whether to generate position independent code (e.g., `-fPIC`)
+# @param {string} INCLUDE - list of includes (e.g., `-I /foo/bar`)
+# @param {string} SOURCE_FILES - list of source files
+# @param {string} LIBPATH - list of library paths (e.g., `-L /foo/bar`)
+# @param {string} LIBRARIES - list of libraries (e.g., `-lopenblas`)
+#/
+$(c_targets): %.out: %.c
+	$(QUIET) $(CC) $(CFLAGS) $(fPIC) $(INCLUDE) -o $@ $(SOURCE_FILES) $< $(LIBPATH) -lm $(LIBRARIES)
+
+#/
+# Runs compiled examples.
+#
+# @example
+# make run
+#/
+run: $(c_targets)
+	$(QUIET) ./$<
+
+.PHONY: run
+
+#/
+# Removes generated files.
+#
+# @example
+# make clean
+#/
+clean:
+	$(QUIET) -rm -f *.o *.out
+
+.PHONY: clean
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/examples/c/example.c b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/examples/c/example.c
new file mode 100644
index 000000000000..81406ef15257
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/examples/c/example.c
@@ -0,0 +1,40 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+#include "stdlib/stats/base/dists/normal/skewness.h"
+#include <stdlib.h>
+#include <stdio.h>
+
+static double random_uniform( const double min, const double max ) {
+	double v = (double)rand() / ( (double)RAND_MAX + 1.0 );
+	return min + ( v*(max-min) );
+}
+
+int main( void ) {
+	double mu;
+    double sigma;
+    double y;
+    int i;
+
+	for ( i = 0; i < 10; i++ ) {
+		mu = random_uniform( -5.0, 5.0 );
+		sigma = random_uniform( 0.0, 20.0 );
+		y = stdlib_base_dists_normal_skewness( mu, sigma );
+		printf( "µ: %.4f, σ: %.4f, skew(X;µ,σ): %.4f\n", mu, sigma, y );
+	}
+}
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/include.gypi b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/include.gypi
new file mode 100644
index 000000000000..575cb043c0bf
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/include.gypi
@@ -0,0 +1,53 @@
+# @license Apache-2.0
+#
+# Copyright (c) 2024 The Stdlib Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# A GYP include file for building a Node.js native add-on.
+#
+# Main documentation:
+#
+# [1]: https://gyp.gsrc.io/docs/InputFormatReference.md
+# [2]: https://gyp.gsrc.io/docs/UserDocumentation.md
+{
+  # Define variables to be used throughout the configuration for all targets:
+  'variables': {
+    # Source directory:
+    'src_dir': './src',
+
+    # Include directories:
+    'include_dirs': [
+      '<!@(node -e "var arr = require(\'@stdlib/utils/library-manifest\')(\'./manifest.json\',{},{\'basedir\':process.cwd(),\'paths\':\'posix\'}).include; for ( var i = 0; i < arr.length; i++ ) { console.log( arr[ i ] ); }")',
+    ],
+
+    # Add-on destination directory:
+    'addon_output_dir': './src',
+
+    # Source files:
+    'src_files': [
+      '<(src_dir)/addon.c',
+      '<!@(node -e "var arr = require(\'@stdlib/utils/library-manifest\')(\'./manifest.json\',{},{\'basedir\':process.cwd(),\'paths\':\'posix\'}).src; for ( var i = 0; i < arr.length; i++ ) { console.log( arr[ i ] ); }")',
+    ],
+
+    # Library dependencies:
+    'libraries': [
+      '<!@(node -e "var arr = require(\'@stdlib/utils/library-manifest\')(\'./manifest.json\',{},{\'basedir\':process.cwd(),\'paths\':\'posix\'}).libraries; for ( var i = 0; i < arr.length; i++ ) { console.log( arr[ i ] ); }")',
+    ],
+
+    # Library directories:
+    'library_dirs': [
+      '<!@(node -e "var arr = require(\'@stdlib/utils/library-manifest\')(\'./manifest.json\',{},{\'basedir\':process.cwd(),\'paths\':\'posix\'}).libpath; for ( var i = 0; i < arr.length; i++ ) { console.log( arr[ i ] ); }")',
+    ],
+  }, # end variables
+}
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/include/stdlib/stats/base/dists/normal/skewness.h b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/include/stdlib/stats/base/dists/normal/skewness.h
new file mode 100644
index 000000000000..99c797fbf323
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/include/stdlib/stats/base/dists/normal/skewness.h
@@ -0,0 +1,38 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+#ifndef STDLIB_STATS_BASE_DISTS_NORMAL_SKEWNESS_H
+#define STDLIB_STATS_BASE_DISTS_NORMAL_SKEWNESS_H
+
+/*
+* If C++, prevent name mangling so that the compiler emits a binary file having undecorated names, thus mirroring the behavior of a C compiler.
+*/
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+* Evaluates the skewness for a normal distribution with mean `mu` and standard deviation `sigma`.
+*/
+double stdlib_base_dists_normal_skewness( const double mu, const double sigma );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // !STDLIB_STATS_BASE_DISTS_NORMAL_SKEWNESS_H
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/lib/native.js b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/lib/native.js
new file mode 100644
index 000000000000..690e9c4d1386
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/lib/native.js
@@ -0,0 +1,63 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var addon = require( './../src/addon.node' );
+
+
+// MAIN //
+
+/**
+* Evaluates the skewness for a normal distribution with mean `mu` and standard deviation `sigma`.
+*
+* @private
+* @param {number} mu - mean
+* @param {PositiveNumber} sigma - standard deviation
+* @returns {number} skewness
+*
+* @example
+* var y = skewness( 0.0, 1.0 );
+* // returns 0.0
+*
+* @example
+* var y = skewness( 5.0, 3.0 );
+* // returns 0.0
+*
+* @example
+* var y = skewness( NaN, 1.0 );
+* // returns NaN
+*
+* @example
+* var y = skewness( 0.0, NaN );
+* // returns NaN
+*
+* @example
+* var y = skewness( 0.0, 0.0 );
+* // returns NaN
+*/
+function skewness( mu, sigma ) {
+	return addon( mu, sigma );
+}
+
+
+// EXPORTS //
+
+module.exports = skewness;
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/manifest.json b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/manifest.json
new file mode 100644
index 000000000000..db80b71a4aa4
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/manifest.json
@@ -0,0 +1,76 @@
+{
+  "options": {
+    "task": "build",
+    "wasm": false
+  },
+  "fields": [
+    {
+      "field": "src",
+      "resolve": true,
+      "relative": true
+    },
+    {
+      "field": "include",
+      "resolve": true,
+      "relative": true
+    },
+    {
+      "field": "libraries",
+      "resolve": false,
+      "relative": false
+    },
+    {
+      "field": "libpath",
+      "resolve": true,
+      "relative": false
+    }
+  ],
+  "confs": [
+    {
+      "task": "build",
+      "wasm": false,
+      "src": [
+        "./src/main.c"
+      ],
+      "include": [
+        "./include"
+      ],
+      "libraries": [],
+      "libpath": [],
+      "dependencies": [
+        "@stdlib/math/base/napi/binary",
+        "@stdlib/math/base/assert/is-nan"
+      ]
+    },
+    {
+      "task": "benchmark",
+      "wasm": false,
+      "src": [
+        "./src/main.c"
+      ],
+      "include": [
+        "./include"
+      ],
+      "libraries": [],
+      "libpath": [],
+      "dependencies": [
+        "@stdlib/math/base/assert/is-nan"
+      ]
+    },
+    {
+      "task": "examples",
+      "wasm": false,
+      "src": [
+        "./src/main.c"
+      ],
+      "include": [
+        "./include"
+      ],
+      "libraries": [],
+      "libpath": [],
+      "dependencies": [
+        "@stdlib/math/base/assert/is-nan"
+      ]
+    }
+  ]
+}
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/package.json b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/package.json
index 7af6f8c3f323..cd1877ca7b92 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/package.json
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/package.json
@@ -14,11 +14,14 @@
     }
   ],
   "main": "./lib",
+  "gypfile": true,
   "directories": {
     "benchmark": "./benchmark",
     "doc": "./docs",
     "example": "./examples",
+    "include": "./include",
     "lib": "./lib",
+    "src": "./src",
     "test": "./test"
   },
   "types": "./docs/types",
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/Makefile b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/Makefile
new file mode 100644
index 000000000000..bcf18aa46655
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/Makefile
@@ -0,0 +1,70 @@
+#/
+# @license Apache-2.0
+#
+# Copyright (c) 2024 The Stdlib Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#/
+
+# VARIABLES #
+
+ifndef VERBOSE
+	QUIET := @
+else
+	QUIET :=
+endif
+
+# Determine the OS ([1][1], [2][2]).
+#
+# [1]: https://en.wikipedia.org/wiki/Uname#Examples
+# [2]: http://stackoverflow.com/a/27776822/2225624
+OS ?= $(shell uname)
+ifneq (, $(findstring MINGW,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring MSYS,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring CYGWIN,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring Windows_NT,$(OS)))
+	OS := WINNT
+endif
+endif
+endif
+endif
+
+
+# RULES #
+
+#/
+# Removes generated files for building an add-on.
+#
+# @example
+# make clean-addon
+#/
+clean-addon:
+	$(QUIET) -rm -f *.o *.node
+
+.PHONY: clean-addon
+
+#/
+# Removes generated files.
+#
+# @example
+# make clean
+#/
+clean: clean-addon
+
+.PHONY: clean
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/addon.c b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/addon.c
new file mode 100644
index 000000000000..11703b5366f9
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/addon.c
@@ -0,0 +1,23 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+#include "stdlib/stats/base/dists/normal/skewness.h"
+#include "stdlib/math/base/napi/binary.h"
+
+// cppcheck-suppress shadowFunction
+STDLIB_MATH_BASE_NAPI_MODULE_DD_D( stdlib_base_dists_normal_skewness )
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/main.c b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/main.c
new file mode 100644
index 000000000000..04cb06b42bdf
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/main.c
@@ -0,0 +1,58 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+#include "stdlib/stats/base/dists/normal/skewness.h"
+#include "stdlib/math/base/assert/is_nan.h"
+
+/**
+* Returns the skewness for a normal distribution with mean `mu` and standard deviation `sigma`.
+*
+* @param mu     mean of the distribution
+* @param sigma  standard deviation of the distribution
+* @return       skewness of the normal distribution
+*
+* @example
+* double y = stdlib_base_dists_normal_skewness( 0.0, 1.0 );
+* // returns 0.0
+*
+* @example
+* double y = stdlib_base_dists_normal_skewness( 5.0, 3.0 );
+* // returns 0.0
+*
+* @example
+* double y = stdlib_base_dists_normal_skewness( NAN, 1.0 );
+* // returns NaN
+*
+* @example
+* double y = stdlib_base_dists_normal_skewness( 0.0, NAN );
+* // returns NaN
+*
+* @example
+* double y = stdlib_base_dists_normal_skewness( 0.0, 0.0 );
+* // returns NaN
+*/
+double stdlib_base_dists_normal_skewness( const double mu, const double sigma ) {
+	if (
+		stdlib_base_is_nan( mu ) ||
+		stdlib_base_is_nan( sigma ) ||
+		sigma <= 0.0
+	) {
+		return 0.0/0.0; // NaN
+	}
+	return 0.0;
+}
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/test/test.native.js b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/test/test.native.js
new file mode 100644
index 000000000000..61c1b06e58a9
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/test/test.native.js
@@ -0,0 +1,111 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var resolve = require( 'path' ).resolve;
+var tape = require( 'tape' );
+var tryRequire = require( '@stdlib/utils/try-require' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var abs = require( '@stdlib/math/base/special/abs' );
+var PINF = require( '@stdlib/constants/float64/pinf' );
+var NINF = require( '@stdlib/constants/float64/ninf' );
+var EPS = require( '@stdlib/constants/float64/eps' );
+
+
+// FIXTURES //
+
+var data = require( './fixtures/julia/data.json' );
+
+
+// VARIABLES //
+
+var skewness = tryRequire( resolve( __dirname, './../lib/native.js' ) );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof skewness, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'if provided `NaN` for any parameter, the function returns `NaN`', function test( t ) {
+	var y = skewness( NaN, 1.0 );
+	t.equal( isnan( y ), true, 'returns NaN' );
+	y = skewness( 1.0, NaN );
+	t.equal( isnan( y ), true, 'returns NaN' );
+	t.end();
+});
+
+tape( 'if provided a nonpositive `sigma`, the function returns `NaN`', function test( t ) {
+	var y;
+
+	y = skewness( 2.0, 0.0 );
+	t.equal( isnan( y ), true, 'returns NaN' );
+
+	y = skewness( 2.0, -1.0 );
+	t.equal( isnan( y ), true, 'returns NaN' );
+
+	y = skewness( 2.0, -1.0 );
+	t.equal( isnan( y ), true, 'returns NaN' );
+
+	y = skewness( 1.0, NINF );
+	t.equal( isnan( y ), true, 'returns NaN' );
+
+	y = skewness( PINF, NINF );
+	t.equal( isnan( y ), true, 'returns NaN' );
+
+	y = skewness( NINF, NINF );
+	t.equal( isnan( y ), true, 'returns NaN' );
+
+	y = skewness( NaN, NINF );
+	t.equal( isnan( y ), true, 'returns NaN' );
+
+	t.end();
+});
+
+tape( 'the function returns the skewness of a normal distribution', function test( t ) {
+	var expected;
+	var delta;
+	var sigma;
+	var tol;
+	var mu;
+	var y;
+	var i;
+
+	expected = data.expected;
+	mu = data.mu;
+	sigma = data.sigma;
+	for ( i = 0; i < mu.length; i++ ) {
+		y = skewness( mu[i], sigma[i] );
+		if ( expected[i] !== null) {
+			if ( y === expected[i] ) {
+				t.equal( y, expected[i], 'mu:'+mu[i]+', sigma: '+sigma[i]+', y: '+y+', expected: '+expected[i] );
+			} else {
+				delta = abs( y - expected[ i ] );
+				tol = 1.0 * EPS * abs( expected[ i ] );
+				t.ok( delta <= tol, 'within tolerance. mu: '+mu[i]+'. sigma: '+sigma[i]+'. y: '+y+'. E: '+expected[ i ]+'. Δ: '+delta+'. tol: '+tol+'.' );
+			}
+		}
+	}
+	t.end();
+});

From 05bd15f4279c19444eefa14d6d16ee0f1cff1f55 Mon Sep 17 00:00:00 2001
From: stdlib-bot <82920195+stdlib-bot@users.noreply.github.com>
Date: Wed, 2 Apr 2025 02:28:16 +0000
Subject: [PATCH 2/6] chore: update copyright years

---
 .../base/dists/normal/skewness/benchmark/benchmark.native.js    | 2 +-
 .../stats/base/dists/normal/skewness/benchmark/c/Makefile       | 2 +-
 .../stats/base/dists/normal/skewness/benchmark/c/benchmark.c    | 2 +-
 .../@stdlib/stats/base/dists/normal/skewness/binding.gyp        | 2 +-
 .../stats/base/dists/normal/skewness/examples/c/Makefile        | 2 +-
 .../stats/base/dists/normal/skewness/examples/c/example.c       | 2 +-
 .../@stdlib/stats/base/dists/normal/skewness/include.gypi       | 2 +-
 .../skewness/include/stdlib/stats/base/dists/normal/skewness.h  | 2 +-
 .../@stdlib/stats/base/dists/normal/skewness/lib/native.js      | 2 +-
 .../@stdlib/stats/base/dists/normal/skewness/src/Makefile       | 2 +-
 .../@stdlib/stats/base/dists/normal/skewness/src/addon.c        | 2 +-
 .../@stdlib/stats/base/dists/normal/skewness/src/main.c         | 2 +-
 .../stats/base/dists/normal/skewness/test/test.native.js        | 2 +-
 13 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/benchmark.native.js b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/benchmark.native.js
index e437d55d195f..9926a7a0f7f8 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/benchmark.native.js
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/benchmark.native.js
@@ -1,7 +1,7 @@
 /**
 * @license Apache-2.0
 *
-* Copyright (c) 2024 The Stdlib Authors.
+* Copyright (c) 2025 The Stdlib Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/c/Makefile b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/c/Makefile
index f69e9da2b4d3..a4bd7b38fd74 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/c/Makefile
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/c/Makefile
@@ -1,7 +1,7 @@
 #/
 # @license Apache-2.0
 #
-# Copyright (c) 2024 The Stdlib Authors.
+# Copyright (c) 2025 The Stdlib Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/c/benchmark.c b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/c/benchmark.c
index 0cf954153418..19b8cc176830 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/c/benchmark.c
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/c/benchmark.c
@@ -1,7 +1,7 @@
 /**
 * @license Apache-2.0
 *
-* Copyright (c) 2024 The Stdlib Authors.
+* Copyright (c) 2025 The Stdlib Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/binding.gyp b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/binding.gyp
index ec3992233442..68a1ca11d160 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/binding.gyp
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/binding.gyp
@@ -1,6 +1,6 @@
 # @license Apache-2.0
 #
-# Copyright (c) 2024 The Stdlib Authors.
+# Copyright (c) 2025 The Stdlib Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/examples/c/Makefile b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/examples/c/Makefile
index 6aed70daf167..25ced822f96a 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/examples/c/Makefile
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/examples/c/Makefile
@@ -1,7 +1,7 @@
 #/
 # @license Apache-2.0
 #
-# Copyright (c) 2024 The Stdlib Authors.
+# Copyright (c) 2025 The Stdlib Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/examples/c/example.c b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/examples/c/example.c
index 81406ef15257..424973a570c0 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/examples/c/example.c
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/examples/c/example.c
@@ -1,7 +1,7 @@
 /**
 * @license Apache-2.0
 *
-* Copyright (c) 2024 The Stdlib Authors.
+* Copyright (c) 2025 The Stdlib Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/include.gypi b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/include.gypi
index 575cb043c0bf..ecfaf82a3279 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/include.gypi
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/include.gypi
@@ -1,6 +1,6 @@
 # @license Apache-2.0
 #
-# Copyright (c) 2024 The Stdlib Authors.
+# Copyright (c) 2025 The Stdlib Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/include/stdlib/stats/base/dists/normal/skewness.h b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/include/stdlib/stats/base/dists/normal/skewness.h
index 99c797fbf323..efb4d620deab 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/include/stdlib/stats/base/dists/normal/skewness.h
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/include/stdlib/stats/base/dists/normal/skewness.h
@@ -1,7 +1,7 @@
 /**
 * @license Apache-2.0
 *
-* Copyright (c) 2024 The Stdlib Authors.
+* Copyright (c) 2025 The Stdlib Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/lib/native.js b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/lib/native.js
index 690e9c4d1386..840bc1f4c855 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/lib/native.js
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/lib/native.js
@@ -1,7 +1,7 @@
 /**
 * @license Apache-2.0
 *
-* Copyright (c) 2024 The Stdlib Authors.
+* Copyright (c) 2025 The Stdlib Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/Makefile b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/Makefile
index bcf18aa46655..7733b6180cb4 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/Makefile
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/Makefile
@@ -1,7 +1,7 @@
 #/
 # @license Apache-2.0
 #
-# Copyright (c) 2024 The Stdlib Authors.
+# Copyright (c) 2025 The Stdlib Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/addon.c b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/addon.c
index 11703b5366f9..fa8cd96911af 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/addon.c
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/addon.c
@@ -1,7 +1,7 @@
 /**
 * @license Apache-2.0
 *
-* Copyright (c) 2024 The Stdlib Authors.
+* Copyright (c) 2025 The Stdlib Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/main.c b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/main.c
index 04cb06b42bdf..eb5e45958d05 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/main.c
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/main.c
@@ -1,7 +1,7 @@
 /**
 * @license Apache-2.0
 *
-* Copyright (c) 2024 The Stdlib Authors.
+* Copyright (c) 2025 The Stdlib Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/test/test.native.js b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/test/test.native.js
index 61c1b06e58a9..53c171279a43 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/test/test.native.js
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/test/test.native.js
@@ -1,7 +1,7 @@
 /**
 * @license Apache-2.0
 *
-* Copyright (c) 2024 The Stdlib Authors.
+* Copyright (c) 2025 The Stdlib Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.

From 09ffbad757bc4f1d7e9dd4d998dc0e8148ed60b4 Mon Sep 17 00:00:00 2001
From: Philipp Burckhardt <pburckhardt@outlook.com>
Date: Wed, 2 Apr 2025 08:45:38 -0400
Subject: [PATCH 3/6] chore: apply suggestions from code review

Signed-off-by: Philipp Burckhardt <pburckhardt@outlook.com>
---
 .../base/dists/normal/skewness/README.md      |  4 ++--
 .../normal/skewness/examples/c/example.c      |  6 ++---
 .../stdlib/stats/base/dists/normal/skewness.h |  2 +-
 .../base/dists/normal/skewness/src/main.c     | 22 +++----------------
 4 files changed, 9 insertions(+), 25 deletions(-)

diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/README.md b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/README.md
index 3d500076518f..c1b045e44185 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/README.md
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/README.md
@@ -156,7 +156,7 @@ for ( i = 0; i < 10; i++ ) {
 
 #### stdlib_base_dists_normal_skewness( mu, sigma )
 
-Evaluates the skewness for a normal distribution with mean `mu` and standard deviation `sigma`.
+Returns the skewness for a normal distribution with mean `mu` and standard deviation `sigma`.
 
 ```c
 double out = stdlib_base_dists_normal_skewness( 0.0, 1.0 );
@@ -201,8 +201,8 @@ static double random_uniform( const double min, const double max ) {
 }
 
 int main( void ) {
-    double mu;
     double sigma;
+    double mu;
     double y;
     int i;
 
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/examples/c/example.c b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/examples/c/example.c
index 424973a570c0..a68b235bcca3 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/examples/c/example.c
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/examples/c/example.c
@@ -26,10 +26,10 @@ static double random_uniform( const double min, const double max ) {
 }
 
 int main( void ) {
+	double sigma;
 	double mu;
-    double sigma;
-    double y;
-    int i;
+	double y;
+	int i;
 
 	for ( i = 0; i < 10; i++ ) {
 		mu = random_uniform( -5.0, 5.0 );
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/include/stdlib/stats/base/dists/normal/skewness.h b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/include/stdlib/stats/base/dists/normal/skewness.h
index efb4d620deab..b0eb9094791b 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/include/stdlib/stats/base/dists/normal/skewness.h
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/include/stdlib/stats/base/dists/normal/skewness.h
@@ -27,7 +27,7 @@ extern "C" {
 #endif
 
 /**
-* Evaluates the skewness for a normal distribution with mean `mu` and standard deviation `sigma`.
+* Returns the skewness for a normal distribution with mean `mu` and standard deviation `sigma`.
 */
 double stdlib_base_dists_normal_skewness( const double mu, const double sigma );
 
diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/main.c b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/main.c
index eb5e45958d05..cc79f1117120 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/main.c
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/src/main.c
@@ -22,29 +22,13 @@
 /**
 * Returns the skewness for a normal distribution with mean `mu` and standard deviation `sigma`.
 *
-* @param mu     mean of the distribution
-* @param sigma  standard deviation of the distribution
-* @return       skewness of the normal distribution
+* @param mu     mean
+* @param sigma  standard deviation
+* @return       skewness
 *
 * @example
 * double y = stdlib_base_dists_normal_skewness( 0.0, 1.0 );
 * // returns 0.0
-*
-* @example
-* double y = stdlib_base_dists_normal_skewness( 5.0, 3.0 );
-* // returns 0.0
-*
-* @example
-* double y = stdlib_base_dists_normal_skewness( NAN, 1.0 );
-* // returns NaN
-*
-* @example
-* double y = stdlib_base_dists_normal_skewness( 0.0, NAN );
-* // returns NaN
-*
-* @example
-* double y = stdlib_base_dists_normal_skewness( 0.0, 0.0 );
-* // returns NaN
 */
 double stdlib_base_dists_normal_skewness( const double mu, const double sigma ) {
 	if (

From dbf69a47b35a94cb67f83c04b4f622d2b77c492b Mon Sep 17 00:00:00 2001
From: Philipp Burckhardt <pburckhardt@outlook.com>
Date: Wed, 2 Apr 2025 08:46:37 -0400
Subject: [PATCH 4/6] bench: replace `randu` with `uniform` in benchmark

---
 .../dists/normal/skewness/benchmark/benchmark.native.js     | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/benchmark.native.js b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/benchmark.native.js
index 9926a7a0f7f8..1213cfb34480 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/benchmark.native.js
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/benchmark.native.js
@@ -23,7 +23,7 @@
 var resolve = require( 'path' ).resolve;
 var bench = require( '@stdlib/bench' );
 var Float64Array = require( '@stdlib/array/float64' );
-var randu = require( '@stdlib/random/base/randu' );
+var uniform = require( '@stdlib/random/base/uniform' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var tryRequire = require( '@stdlib/utils/try-require' );
 var EPS = require( '@stdlib/constants/float64/eps' );
@@ -51,8 +51,8 @@ bench( pkg+'::native', opts, function benchmark( b ) {
 	mu = new Float64Array( len );
 	sigma = new Float64Array( len );
 	for ( i = 0; i < len; i++ ) {
-		mu[ i ] = ( randu() * 100.0 ) - 50.0;
-		sigma[ i ] = ( randu() * 20.0 ) + EPS;
+		mu[ i ] = uniform( -50.0, 50.0 );
+		sigma[ i ] = uniform( EPS, 20.0 );
 	}
 	b.tic();
 	for ( i = 0; i < b.iterations; i++ ) {

From 3f77189df2f4f9c1f48e9c8638db43ceea1fbf75 Mon Sep 17 00:00:00 2001
From: Philipp Burckhardt <pburckhardt@outlook.com>
Date: Wed, 2 Apr 2025 08:47:18 -0400
Subject: [PATCH 5/6] bench: replace `randu` with `uniform` in benchmark

---
 .../stats/base/dists/normal/skewness/benchmark/benchmark.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/benchmark.js b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/benchmark.js
index 4e5288f24dbe..0a8c75085af0 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/benchmark.js
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/benchmark/benchmark.js
@@ -22,7 +22,7 @@
 
 var bench = require( '@stdlib/bench' );
 var Float64Array = require( '@stdlib/array/float64' );
-var randu = require( '@stdlib/random/base/randu' );
+var uniform = require( '@stdlib/random/base/uniform' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var EPS = require( '@stdlib/constants/float64/eps' );
 var pkg = require( './../package.json' ).name;
@@ -42,8 +42,8 @@ bench( pkg, function benchmark( b ) {
 	mu = new Float64Array( len );
 	sigma = new Float64Array( len );
 	for ( i = 0; i < len; i++ ) {
-		mu[ i ] = ( randu() * 100.0 ) - 50.0;
-		sigma[ i ] = ( randu() * 20.0 ) + EPS;
+		mu[ i ] = uniform( -50.0, 50.0 );
+		sigma[ i ] = uniform( EPS, 20.0 );
 	}
 
 	b.tic();

From 3ced4d86722b23153cca6a09cd6fbce369276c98 Mon Sep 17 00:00:00 2001
From: Philipp Burckhardt <pburckhardt@outlook.com>
Date: Wed, 2 Apr 2025 08:47:36 -0400
Subject: [PATCH 6/6] chore: update description

Signed-off-by: Philipp Burckhardt <pburckhardt@outlook.com>
---
 .../@stdlib/stats/base/dists/normal/skewness/lib/native.js      | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/lib/native.js b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/lib/native.js
index 840bc1f4c855..4fcbae196edb 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/lib/native.js
+++ b/lib/node_modules/@stdlib/stats/base/dists/normal/skewness/lib/native.js
@@ -26,7 +26,7 @@ var addon = require( './../src/addon.node' );
 // MAIN //
 
 /**
-* Evaluates the skewness for a normal distribution with mean `mu` and standard deviation `sigma`.
+* Returns the skewness for a normal distribution with mean `mu` and standard deviation `sigma`.
 *
 * @private
 * @param {number} mu - mean