I am looking to calculate Cohen's d for a Welch test so that I can calculate an effect size for unequal variances. The only equation I could find is here (https://www.datanovia.com/en/lessons/t-test-effect-size-using-cohens-d-measure/#cohens-d-for-welch-test). However, I am struggling to calculate it with the output given in SAS or SPSS.
Does anyone have any code or suggestions?
From the equation on the website you provided, it seems like you could calculate the Cohen's D by hand using the descriptives from your Welch's t-test (the standard deviation is the square root of the variance for each group, so you should get the variances for each group by squaring those values). As long as you are confident that the equation provided is correct, I think it should work out? I could be off-base though!
Perhaps you may try this MS Excel calculator:
Research Welch's t-test for comparing two independent groups: An Exce...
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