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Re: st: displaying/summarizing covariate balance


From   "Austin Nichols" <austinnichols@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: displaying/summarizing covariate balance
Date   Fri, 19 Sep 2008 10:42:22 -0400

Pierre Azoulay <pierre.azoulay@gmail.com>:
You are using -nnmatch- from SSC, I take it? Just use the same tests
as used for testing balance of (pretreatment) covariates under random
assignment: if treatment is a var tr taking on values 0/1 and
covariates are x* then
 hotelling x*, by(tr)
and
 reg tr x*
give the same F-test for differences in means (add ,robust to the
latter to relax assumptions about equal variance, or use logit or
probit for alternative discriminants).  Or did you want to compare the
whole distribution of values for all x* (in which case a bunch of
kernel density graphs are in order)?

On Fri, Sep 19, 2008 at 10:18 AM, Pierre Azoulay
<pierre.azoulay@gmail.com> wrote:
> Dear Statalisters,
>
> I am doing a very simple nearest-neighbor matching exercise for a
> paper of mine, and I would be interested in suggestiopns on how best
> to summarize and/or display covariate balance among the matched units,
> if possible with code examples. A search on "covariate balance" in
> stata list did not reveal anything enlightening.
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