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Approximating the distribution of Cohen's d_p in within-subject designs

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Doi: 10.20982/tqmp.16.4.p418

Cousineau, Denis
418-421
Keywords: Standardized mean difference , Cohen's d_p , noncentral t distribution
(no sample data)   (no appendix)

In this document, I demonstrate an approximate distribution of Cohen's d_p in within-subject designs. The distribution follows a noncentral t distribution with degrees of freedom depending on the correlation between the measures. The result generalizes the distribution of Cohen's d_p to both between-subject and single-group designs, yielding a flexible and integrative measure for comparing effect sizes across different study designs.


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