| APPLET | SOURCE | DESCRIPTION |
|
| Several | Russ Lenth's Java applets for power and sample size | For several tests, including one proportion, two proportions, one sample t or two sample t, computes either required sample size(s) to achieve specified power or power based on specified sample size. more |
| Researcher's Toolkit | DSS Research | Several calculators for both power and sample size for one or two means or one or two proportions. more |
| Statistical Tests, Sample Size menu (several options) | Dept. of Obstetrics and Gynaecology, Chinese Univ. of Hong Kong, Statistical Toolbox | Several sample size/power calculators for a number of one and two population tests. more |
| Statools | Southwest Oncology Group Statistical Center | Several power/sample size calculators for one or two means or one or two proportions. more |
| Proportion Difference Power/Sample Size Calculation | Statpages.org (Pezzullo) | Calculates sample size for test of difference between two proportions to achieve specified power. more |
| Several for comparing two means and two proportions | Sealed Envelope | Calculates sample size for parallel-group equivalence and superiority trials, with continuous or binary outcome variables. more |