Gpower

The new version fixes a problem that surfaced with MacOS 8. The program is free. Support is partial. The file has been checked using Disinfectant 3.7.1. I would greatly appreciate if you could make this file available on your Mac archive. Thanks. This is what G*Power does: G*Power performs high-precision statistical power analyses for the most common statistical tests in behavioral research, that is, t-tests, F-tests, and Chi^2-tests. G*Power computes (a) power values for given sample sizes, effect sizes and alpha levels (post hoc power analyses), (b) sample sizes for given effect sizes, alpha levels, and power values (a priori power analyses), and (c) alpha and beta values for given sample sizes, effect sizes and beta/alpha ratios (compromise power analyses). The program may be used to display graphically the relation between any two of the relevant variables and it offers the opportunity to compute the effect size measures from basic parameters defining the alternative hypothesis.