When to Choose Glass’s Delta
If your standard deviations are not significantly different between groups, use Hedges’ g or Cohen’s d instead. If your sample size is small (less than 20) choose Hedges’ g over Cohen’s d. For samples 20 or greater, the two statistics are roughly equivalent.
Stephanie Glen. "Glass’s Delta" From StatisticsHowTo.com: Elementary Statistics for the rest of us! https://www.statisticshowto.com/glasss-delta/
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