Effect size calculator
Calculate Cohen's d, Hedges' g between two groups with an interpretation of the effect size.
Effect size calculator
About the tool
Effect size reveals the practical importance of a difference, not just its statistical significance. d = (M1 − M2) ÷ is the pooled standard deviation, and g is d corrected for small samples. Interpretation follows Cohen's benchmarks: 0.2 small, 0.5 medium, 0.8 large.
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