G*Power (Intel 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 PPC version, as well as a Windows/Vista version. Register for free for info on updates.

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