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st: paired t-test on matched sample after propensity score matching


From   "Weichle, Thomas" <Thomas.Weichle@va.gov>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: paired t-test on matched sample after propensity score matching
Date   Fri, 14 Aug 2009 10:59:24 -0500

Dear Statalisters,
I'm trying to do a paired t-test on a matched sample after performing
propensity score matching to assess differences in measured
characteristics between treated and untreated individuals.  I've used
psmatch2 to perform the matching.  I'm familiar with the syntax to do a
paired t-test when there are 2 variables and we want to test whether
they differ (ttest varname1 == varname2).  However, the way my data is
set up after performing the matching doesn't have 2 separate variables.
For example, there is 1 column for each measured characteristic, an
indicator for treatment status, and another variable indicating which
control the treated was matched to.  Does anyone have any experience
trying to perform this matched individuals paired t-test?  Maybe I don't
have my data set up correctly.

Tom Weichle
Math Statistician
Center for Management of Complex Chronic Care (CMC3)
Hines VA Hospital, Bldg 1, C202
708-202-8387 ext. 24261
Thomas.Weichle@va.gov 

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