Effect Size Calculator

Calculate Cohen's d effect size, which measures the standardized difference between two group means.

Cohen's d

0.5432

|d|0.5432
Pooled SD11.0454
Raw Difference6.0000

Cohen's d vs Group 1 Mean

सूत्र देखें →

सूत्र

## How to Calculate Cohen's d ### Formula **d = (Mean1 - Mean2) / Pooled SD** where Pooled SD = sqrt((s1^2 + s2^2) / 2) Cohen's d expresses the difference between two means in standard deviation units. Guidelines: |d| < 0.2 = negligible, 0.2-0.5 = small, 0.5-0.8 = medium, > 0.8 = large. Effect size is independent of sample size, unlike the p-value.

हल किया गया उदाहरण

Group 1: mean = 78, SD = 10. Group 2: mean = 72, SD = 12.

  1. 01Pooled SD = sqrt((100 + 144) / 2) = sqrt(122) = 11.045
  2. 02d = (78 - 72) / 11.045 = 6 / 11.045 = 0.5432
  3. 03|d| = 0.5432 which is a medium effect size