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Re: st: RE: Meta analysis of subgroups in Stata using the -by- option:Solved


From   Vivien L Hendry <vlh500@york.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Meta analysis of subgroups in Stata using the -by- option:Solved
Date   Wed, 24 May 2006 10:26:17 +0100

Tom,
Thank you! Your advice worked perfectly, reinstalling the commands (and ignoring Stata's comments that everything was up to date!) has solved my problem.

Thanks for taking the time to answer my question, I really appreciate your help.
best, Vivien

Steichen, Thomas J. wrote:


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).

Tom




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