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Re: st: N to 1 matching without replacement

From   Austin Nichols <>
Subject   Re: st: N to 1 matching without replacement
Date   Wed, 5 May 2010 12:53:51 -0400

Russell Callaghan <> :
-psmatch2- (on SSC) has a noreplacement option; but once you have
matched n cases onto each of the treatment cases, you can only see the
id of the first match in the _n1 variable.  I guess you could hack
into the code, at places like


to instead create a set of N match id variables.  Make sure you save
the resulting bastardized program as my_psmatch.ado or somesuch.

On Wed, May 5, 2010 at 12:35 PM, Russell Callaghan
<> wrote:
> Hello,
> I want to use psmatch2 (or any other STATA propensity score matching
> algorithm) to perform an N to 1 matching without replacement. I have
> looked at the STATAlist extensively and have found no solution to my
> problem. Although psmatch2 provides 1 to n matching with replacement, I
> want to do matching without replacement so that I can then do a Cox
> regression which accounts for the correlated structure of the data by
> using the VCE(cluster paired) command. Any thoughts about the way ahead?
> Thanks,
> Russ
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