Frequently Asked Questions
What is Cohen's d?
A standardized effect size for the difference between two means: d = (m₁ - m₂) / pooled SD. Lets you compare effect magnitudes across studies.
What is a "large" effect?
Cohen's bench marks: 0.2 small, 0.5 medium, 0.8 large. These are general guidelines - some fields use stricter or looser thresholds.
Why use Hedges' g?
It corrects d for small-sample upward bias. For n > 50 the correction is negligible, but at n = 20 it can shift d meaningfully.
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This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.