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st: propensity score matching with caliper
From
Scott Strassels <[email protected]>
To
[email protected]
Subject
st: propensity score matching with caliper
Date
Wed, 24 Feb 2010 14:29:37 -0600
Hello everyone,
I have a question about propensity score matching using psmatch2 with Stata 11. I've been digging through the literature and Statalist archives on the topic without much luck. I think I'm using psmatch2 like other authors have, but I don't understand the results.
My colleagues and I have already generated the propensity score. Here's what I've been doing:
set seed 1000
. gen x = uniform()
. sort x
. psmatch2 treatm, pscore(propen) neighbor(1) ate noreplace caliper (0.15)
. sort _id
. gen match = id[_n1]
(309 missing values generated)
. gen treat = id if _nn == 1
(309 missing values generated)
. drop if treat == .
(309 observations deleted)
. save "/Users/scott/Desktop/propensity/Pali vs Ris caliper 022310.dta", replace
(note: dataset contains 0 observations)
Any suggestions would be very much appreciated.
Thanks,
Scott
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