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G*Power 3

A simple-to-use program for computing power analyses for all common test statistics (and beyond). For details click here

 

For more details see: 

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.