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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.

What's New

Version 3.1.9.2:
  • Fixed a bug in the ?2 tests, Goodness-of-fit tests: Contingency tables module which prevented the computed effect size from appearing in the effect size drawer.

Requirements

OS X 10.7 or later

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conroy.r Member IconReview+3
conroy.r
+3

This release marks a huge increase in the capability of G*Power, which now calculates for wide variety of designs. It is based on the notion of an effect size, and one of the useful features is its ability to calculate effect size from descriptive statistics and then transfer the result to the calculation of sample size.

For many researchers, G*Power will be sufficient to see if your potential sample size will have a reasonable chance of capturing the effect you are looking for (assuming the effect exists!). The interface design makes calculations rapid and simple.

The help files are online, and look well structured. Unfortunately, not all help topics are yet complete.

Of course, if you don't know what sample size software should do, the application will make no sense to you!

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Details

Downloads 22,806
Version Downloads 2,948
License Free
Date 23 Mar 2014
Platform OS X / Intel 32
Price Free
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