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Cohen's d
A statistical measure of effect size commonly used in psychiatric research to quantify the magnitude of treatment differences between groups.
Full Definition
Cohen's d is a standardized measure of effect size that quantifies the difference between two group means in terms of standard deviation units. In psychiatric research, Cohen's d is frequently used to assess the clinical significance of treatment effects, with values of 0.2, 0.5, and 0.8 conventionally interpreted as small, medium, and large effects respectively. This metric allows researchers to compare treatment effects across different studies and outcome measures.
Usage
Usage note: Always include the apostrophe and capitalize 'Cohen's'; italicize the 'd' in formal writing.
In Context
- "The treatment showed a large effect size (Cohen's d = 0.82) on the primary depression outcome." — Results section
- "Effect sizes (Cohen's d) were calculated for all continuous outcome measures at each time point." — Statistical methods
Also known as
effect size
standardized mean difference
Don't confuse with
Cohen's kappa
Hedges' g