G*Power (PPC Version)

Version: 3.0.10 || Release Date: 2008-01-24 || License: Freeware Developer: http://www.psycho.uni-duesseldorf.de | App Owner: alf

G*Power 3 covers statistical power analyses for many different statistical tests of the

* F test,
* t test,
* χ2-test and
* z test families and some
* exact tests.

G*Power 3 offers five different types of power analyses:

* A priori (sample size N is computed as a function of power level 1-β, significance level α, and the to-be-detected population effect size)
* Compromise (both α and 1-β are computed as functions of effect size, N, and an error probability ratio q = β/α)
* Criterion (α and the associated decision criterion are computed as a function of 1-β, the effect size, and N)
* Post-hoc (1-β is computed as a function of α, the population effect size, and N)
* Sensitivity (population effect size is computed as a function of α, 1-β, and N)

G*Power 3 provides improved effect size calculators and graphic options. It supports both a distribution-based and a design-based input mode.

There is a separate Intel version, as well as a Windows/Vista version. Register for free for info on updates.

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