I am trying to do a meta analysis, involving continuous data. I am trying to do this meta analysis in Stata using the metan
command.
However, this data is organized in different fashions, where I have some studies with data listed as change in means with their standard errors and other data which is listed as the raw means and standard deviations.
Is there a way to combine this data and proceed with the analyses?
Best Answer
I'm assuming that you want to compute standardised group mean differences for all studies (i.e., Cohen's $d$).
(mean1 - mean2) / sd
. See here for some calculators and formulas for various formulas. In particular there are various ways of calculating the standard deviation.