estimatesamples

A Shiny app to estimate number of samples in a proportions test derived from Casagrande, Pike and Smith (1978) Biometrics 34: 483-486 and Fleiss, Tytun and Ury (1980) Biometrics 36: 343-346.

Inputs

• Alpha Value - Probability for Type I (false positive) error
• Tails - One-tailed (e.g., greater than or less than) or two-tailed (e.g., equal or not-equal) test
• Beta Value - Probability for Type II (false negative) error
• p1(%) - Proportion (expressed as a percentage) of positive outcomes in the first group
• p2(%) - Proportion (expressed as a percentage) of positive outcomes in the second group
• ratio - Ratio of the sample in the second group to the first group
• Samples per Week - Depending on the person hours and business context limitations, set the number of samples that would be collected per week during the course of the experiment

Outputs

• Samples - Total sample size for both groups
• Weeks - Weeks to finish the work
• Days - Days to finish the work
• Months - Months to finish the work

Static Demo