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st: psmatch more then one neighbour


From   Jörg Eulenberger <j.eulenberger@web.de>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: psmatch more then one neighbour
Date   Thu, 11 Nov 2010 13:02:51 +0100


Dear Statalisters,
i want to create a control group for an Treatment group.

this Syntax make nearly what i want. But is it possible to match 2 Neighbours to each person from the treatment group (1:2)?

************
pscore treatment  x1  x2, pscore(p) blockid(blockf1) comsup level(0.001)
set seed 1000
gen x = uniform()
sort x
psmatch2 treatment, pscore(p) neighbor(1) ate noreplace caliper (.01)
sort _id
gen match = id[_n1]
gen treat = id if _nn == 1
drop if treat == .
tab treatment
**************
Thanks, Jörg

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