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st: psmatch2??

Subject   st: psmatch2??
Date   Fri, 2 Oct 2009 11:05:52 -0700 (PDT)

Dear Statalisters,

I was wondering if you could help me figure something out related to psmatch2. So, the idea here is to find a limited number of untreated participants that are similar on propensity score with the treated group, if I am not mistaken. For the nearest neighbor method, if we chose for example 10 or 15, what does that do. Does it give at most 15 nearest neighbors or exactly 15 nearest neighbor per ID? Also, after doing that we get _n1, _nn, _pscore, _support, _weight. Which one of those can be used to run a logistic regression model with say binary outcome y later on  and take into account the PS or is that irrelevant? If we restrict the sample to those who had _weight variable that is nonmissing, would that do it? Thanks a lot for any help you can provide,



May Baydoun, PhD in Epidemiology (UNC-Chapel Hill)  Staff Scientist,  National Institute on Aging, NIH/IRP,  Biomedical Research Center,  Baltimore, MD


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