The effect size index, d, is not appropriate for one-way ANOVA data.

Question

Quizplus · Accepted Answer

The effect size index, d, is typically used for comparing means between two groups (e.g., in t-tests), but for one-way ANOVA, which involves comparisons among more than two groups, other effect size measures like eta squared (η²) or partial eta squared (η²) are more appropriate. However, Cohen's d can still be calculated for pairwise comparisons within ANOVA as a post-hoc analysis.

The Effect Size Index, D, Is Not Appropriate for One-Way