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For a squared partial correlation, the same definition is employed, but the squared partial correlation coefficient is substituted for R2. For a squared semipartial (part) correlation coefficient,  EMBED Equation.3 , where the numerator is the squared semipartial correlation coefficient for the predictor of interest and the denominator is 1 less the squared multiple correlation coefficient for the full model. Cohen considered an f2 of .02 to be a small effect, .15 a medium effect, and .35 a large effect. We can translate these values of f2 into proportions of variance by dividing f2 by (1 + f2 ): A small effect accounts for 2% of the variance in the criterion variable, a medium effect accounts for 13%, and a large effect 26%. The number of subjects required varies with the number of predictor variables, as shown below: Effect Size# predictorsSmallMediumLarge2481673035477634459984385645914266869745772610248875710750 Where Can I Find More on Power Analysis? The classic source is Cohen, J. (1988). Statistical power analysis for the behavior sciences. (2nd ed.). Hillsdale, NJ: Erlbaum Call number JZ1313 .D36 2002 in Joyner Library. I have parts of an earlier (1977) edition. Karl Wuensch, East Carolina University. Revised November, 2009.  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