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st: "how close is close?" -nnmatch- and reviewer complains
From
Mirko Moro <[email protected]>
To
[email protected]
Subject
st: "how close is close?" -nnmatch- and reviewer complains
Date
Wed, 25 Apr 2012 10:29:33 +0100
Dear Statalisters,
I have estimated a regression like:
Y = a + b_1T +b_2C + e,
where T takes the value of 1 if the group was treated, 0 otherwise.
The groups were randomly selected and a probit regression of T on a
bunch o characteristics show that they are not different.
The referee asked me to include matching estimators as robustness check.
I use the –nnmatch- command in Stata that uses the algorithm presented
in Abadie et al. And I presented the results using different numbers
of neighbours (from 1 to 6).
The referee then added:
"On matching: the authors should provide more details on how good the
matching is (How close is close? Are the covariates balanced after the
matching? Are all the observations matched?)"
So I guess I need to show him/her something. As -nnmatch- does not see
to have any diagnostic, should I use some other codes, like
-psmatch2-? Any suggestions?
Mirko
Abadie et al (2004) Implementing matching estimators for average
treatment effects in Stata. The Stata Journal (2004) 4, Number 3, pp.
290–311.
--
Mirko Moro
Lecturer in Economics
Economics Division
University of Stirling
FK94LA
Scotland (UK)
t: +44(0)1786467479
f: +44(0)1786467469
e: [email protected]
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