Cohen's d for one-sample t tests from descriptive statistics

Cohen's d is an effect size statistic for t-tests. This version is for the one-sample t test that uses descriptive statistics.

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Notes

The formula is the classic, simple Cohen's d: d = (M1 - M2) / SD

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

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

Wikipedia: Effect size

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