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st: psm question
From
俊利,俞 Junli-Yu <[email protected]>
To
[email protected]
Subject
st: psm question
Date
Tue, 19 Feb 2013 10:42:47 +0800
Dear Statalister,
My master sample(50 obs.), the pairs sample(200 obs.)
I use “psmatch2” command:
//
cap drop u
set seed 500
g u = runiform()
sort u
psmatch2 X ControlVar , neighbor(1) logit
order X ControlVar _pscore- _pdif
pstest ControlVar
drop if _weight==.//
my question is the support/matched pairs sample(only 35 obs.) is less
than master sample(50 obs.).
Why? how to solve this problem that make the matched sample is 50.
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