Effect Size
Cohen d measures the standardized difference between two group means. Unlike p-values, effect sizes are independent of sample size and provide a measure of practical significance.
Calculate effect size between two groups with Cohen d, Hedges g, and overlap percentage.
Cohen's d
0.9054
Hedges' g
0.8936
Overlap
1.48%
Effect Size
Large
Interpretation
Large practical difference — substantial
Cohen d measures the standardized difference between two group means. Unlike p-values, effect sizes are independent of sample size and provide a measure of practical significance.