What is G*Power?

GPower is a tool to compute statistical power analyses for many different t tests, F tests, χ2 tests, z tests and some exact tests. GPower can also be used to compute effect sizes and to display graphically the results of power analyses.

References

If you use G*Power for your research, then please include one or both of the following references (depending on what is appropriate) to the program in the papers in which you publish your results:

Faul, F., Erdfelder, E., Lang, A.-G., & Buchner, A. (2007). G*Power 3: A flexible statistical power analysis program for the social, behavioral, and biomedical sciences. Behavior Research Methods, 39, 175-191. Download PDF

Faul, F., Erdfelder, E., Buchner, A., & Lang, A.-G. (2009). Statistical power analyses using G*Power 3.1: Tests for correlation and regression analyses. Behavior Research Methods, 41, 1149-1160. Download PDF