When the difference in gain scores may be identical in two studies, the effect size is bound to be identical.

Name: When the difference in gain scores may be identical in two studies, the effect size is bound to be identical.
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Quizplus · Accepted Answer

Effect size takes into account not only the difference in gain scores but also the variability within each study's sample, so even if the difference in gain scores is the same, the effect size may differ if the variability in one study's sample is greater than the other's.

When the Difference in Gain Scores May Be Identical in Two