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G*Power – A free program for Statistical Power Analysis

Free Post-hoc Statistical Power Calculator for Multiple Regression from Daniel Soper's Free Statistics Calculators website. Computes the observed power for a study, given the observed alpha level, the number of predictors, the observed R-square, and the sample size.

Free A-priori Sample Size Calculator for Multiple Regression from Daniel Soper's Free Statistics Calculators website. Computes the minimum required sample size for a study, given the alpha level, the number of predictors, the anticipated effect size, and the desired statistical power level.