The effect size measure for the one-way within-groups ANOVA is Cohen's d.

Name: The effect size measure for the one-way within-groups ANOVA is Cohen's d.
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Cohen's d is a measure of effect size for two-group comparisons, not for within-group comparisons like the one-way within-groups ANOVA. Other measures of effect size, such as eta-squared or omega-squared, are more appropriate for the one-way within-groups ANOVA.

The Effect Size Measure for the One-Way Within-Groups ANOVA Is