G*Power for Mac
Statistical power analysis program.
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G*Power overview
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 in version 3.1.9.6
Version 3.1.9.6:
View older G*Power versions Fixed:
- A bug in z tests: Generic z test: Analysis: Criterion: Compute alpha: The critical z was calculated incorrectly.
- A bug in t tests: Linear bivariate regression: One group, size of slope: |sy/sx| was sometimes calculated inccorrecty.
G*Power for Mac
Free
In English
Version 3.1.9.6
What users say about G*Power
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Comments
User Ratings
Mar 21 2015
Version: 3.1.9.2
I have used this over years to illustrate key statistical concepts to students; I plan to use it in a book on observer performance that I am working on; very intuitive interface;
Mar 1 2007
Version: 3.0.2
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!