Cohen's d for dependent-samples (paired) t test from descriptive statistics

Cohen's d is an effect size statistic for t-tests.

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Notes

The Cohen's d calculation for dependent-samples t tests are the difference score mean divided by the difference score standard deviation: M_D / SD_D.

Suggested effect size interpretation (Sawilowsky, 2009):

• .01: Very small
• .2: Small
• .5: Medium
• .8: Large
• 1.2: Very large
• 2.0: Huge

These value labels are not meant to be absolute standards. The interpretation depends upon the research context.

Sources

Datanovia.com T-test Effect Size using Cohen's d Measure

Sawilowsky, S.S. (2009). New effect size rules of thumb. Journal of Modern Applied Statistical Methods. 8(2), 597-599. https://doi.org/10.22237/jmasm/1257035100

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