[R] Cohen's d on Adjusted Means (UNCLASSIFIED)
Bliese, Paul D LTC USAMH
paul.bliese at us.army.mil
Thu Apr 19 15:54:57 CEST 2007
I have a large group randomized trial (pre-post design) where the
randomization was marginally successful. Given the pre-existing
differences among groups, it makes sense to report adjusted means (aka
least squares means though I estimated them via predictions from lme
rather than lm).
I would like to report effect sizes (Cohen's d) calculated as:
Can anyone provide advice on what would be a reasonable value to use for
the variance estimate in the equation?
Any other thoughts on how to calculate effect sizes on adjusted mean
LTC Paul D. Bliese
Commander, US Army Medical Research Unit - Europe
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