How can I convert difference-in-differences to an effect size?

Asked May 03 '19 at 16:27

Active May 03 '19 at 16:27

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I haven't been able to find a good source on a way to convert the difference in differences to Cohen's D. The way I've been calculating the DD is:

((mean_treatment_post - mean_treatment_pre) - (mean_control_post - mean_control_pre)) / sd

How can I convert this to a Cohen's D or Glass' Delta?

asked May 03 '19 at 16:27

John-Henry

Have you tried looking at other answers on this site like https://stats.stackexchange.com/questions/256053/variance-of-cohens-d-for-within-subjects-designs which seems quite fully explained? – mdewey May 04 '19 at 13:40
Possible duplicate of [Variance of Cohen's $d$ for within subjects designs](https://stats.stackexchange.com/questions/256053/variance-of-cohens-d-for-within-subjects-designs) – mdewey May 04 '19 at 13:41

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