G*Power

G*Power 3.1

Free
Creates statistical power analyses for various tests.
 
3.1.9.3 (See all)
Computes statistical power analyses for a number of various tests, including F tests, χ2 tests and z tests. Computes effect sizes and shows graphics of the results of power analyses. Supports two input mode: distribution-based and design-based. Offers five various types of power analyses.

G*Power is a statistical power analysis program. It is a major extension of, and improvement over, the previous version, covering many different statistical tests of the F, t, chi-square, and z test families as well as some exact tests. G*Power 3 provides improved effect size calculators and graphics options, it supports both a distribution-based and a design-based input mode, and it offers five different types of power analyses. Like its predecessors, G*Power 3 is free.

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