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Re: st: RE: metan with repeated-measures designs?
From
"Ploutz-Snyder, Robert (JSC-SK)[USRA]" <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: RE: metan with repeated-measures designs?
Date
Sat, 24 Jul 2010 13:04:10 -0500
You are correct in that all I have is means from manuscripts, so I
can't work w raw data.
Interestind idea to estimate from a single study. Hmmm
On Jul 23, 2010, at 2:43 PM, "Tiago V. Pereira" <[email protected]
> wrote:
> what if you create a single effect size (or something) like :
>
> Delta_i = (pos[right leg]-pre[right leg])-(pos[left leg]-pre[left
> leg])
>
> for the ith time (i = 1,2,3...n).
>
> The variance for Delta_i is very straightforward for normal variables.
>
> Then, use a multivariate meta-analysis approach.
>
> Ben is right, -mvmeta1- may be what you are looking for. However,
> as you
> are working with summary data (probably from reported data, am I
> right?),
> you don't have an estimate for the covariances for the effect sizes.
>
> A strategy would be to search in the literature for these estimates
> (or
> calculate them using a single study with raw data) - then try several
> other values in sensitivity analyses.
>
> I believe there is no Stata code to perform meta-analysis of
> repeated-measures exactly as you are looking for.
>
> Tiago
>
>
>
>
>
>
>
>
>
> -----------------------------
> Statalisters,
> Please forgive my re-post, but I'm hoping there's a gem of info out
> there??
>
> I'm looking for help using -matan- (or other) command for meta
> analysis of
> studies that all used repeated measures designs. In the most simple
> form,
> I'd like to be able to estimate an across-studies effect for Pre/Post
> differences when all I can extract from the literature are means and
> SD
> pre and post for several studies (i.e. no mean difference score with
> SD-diff were reported in any studies).
>
> -metan- is great, but it's written for independent groups
> designs... is
> there a way to accommodate repeated-measures designs with -metan- or
> other
> user-written commands?
>
> Rob
>
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