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st: RE: Meta analysis of subgroups in Stata using the -by- option
Vivien L Hendry writes:
> I am trying to perform subgroup analyses within a larger meta
> analysis of
> effect sizes (odds ratios). The meta analysis commands appear to have
> installed successfully (in version 9.2) and all other meta &
> metan commands
> are working. The analyse -by variable- option appears to
> exist as an option
> in the metan window, but the analysis itself will not run. I
> keep getting
> the response that "option by() not allowed r(198)",
> regardless of whether
> the commands are given via the pop-up window or typed in
> directly as -metan
> abcd, by(variable)-.
> Please could you give me some pointers on how to get this
> command to work?
> I haven't been able to find information on how to deal with
> this elsewhere.
> If not, is anyone aware of an alternative method that I could
> try, please?
Are you running at least version 1.81 of -metan-? (The most recent is 1.86 and is available in the -metaaggr- package.) Use -which
metan- to get the version #. -by()- was not in the earlier versions.
I tried -by()- with both a numeric and a string variable and both worked fine on Stata v8.2 (I do not have 9.2 installed).
You can use an -if- statement to get the analysis for a subset (but you will not get the between-groups tests or combined graphs).
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