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Category: Effect Size Calculators
Effect Size Calculators
Below you will find descriptions and links to 5 free statistics calculators for computing statistical effect sizes.
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This calculator will tell you the (two-tailed) effect size for a Student t-test (i.e., Cohen's d), given the mean and standard deviation for two independent samples of equal size.
This calculator will tell you the effect size for a hierarchical multiple regression study (Cohen's f2), given an R2 value for a set of independent variables A, and an R2 value for the sum of A and another set of independent variables B. The value returned by the calculator is the effect size attributable to the addition of set B to the model.
This calculator will tell you the effect size for a multiple regression study (i.e., Cohen's f2), given a value of R2.
This calculator will compute the 99%, 95%, and 90% confidence intervals for the f2 effect size associated with a multiple regression study, given the f2 value, the number of predictors in the model, and the total sample size.
This calculator will compute an R2 value for a multiple regression model, given Cohen's f2 effect size for the model.