One Arm Binomial Sample Size and Power

Program Code

The program is written in JavaScript.

Source

Fleiss, J.L. Statistical Methods for Rates and Proportions (1981), pp. 13-15.

* The formula uses the arcsin transformation to achieve better small sample properties.

Input Items

The user is prompted for values to the following items. For items that have initial default values set, the values are given in parentheses.

One-sided or two-sided test

p₀, the proportion for the null hypothesis

p_a, the proportion for the alternative hypothesis

1- b, the desired power for sample size estimation, or n, the total sample size for power estimation