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st: metan: can data be pooled when one has mean before and after scores, but not the mean difference?
From
Michael McCulloch <[email protected]>
To
Statalist Statalist <[email protected]>
Subject
st: metan: can data be pooled when one has mean before and after scores, but not the mean difference?
Date
Mon, 10 May 2010 09:52:18 -0700
Hello Statalist members,
The following example in the -metan- command (sbe24_3) performs meta-
analysis of continuous means, in which the syntax calls for effect
size mean, sample size and standard deviation from both the treatment
and control groups.
. metan tsample tmean tsd csample cmean csd,
> by(type_study) sgweight fixed second(random)
> rfdist counts label(namevar = id)
> favours(Treatment reduces blood pressure # Treatment increases
blood pressure)
My question is whether data can be pooled when one has the mean values
of "before treatment" and "after treatment" for each of two treatment
groups, but not the mean difference?
Best wishes,
Michael McCulloch
Pine Street Foundation
124 Pine Street
San Anselmo, CA 94960-2674
tel: 415-407-1357
fax: 206-338-2391
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