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st: propensity Score Matching

From   "Monica Ospina" <[email protected]>
To   <[email protected]>
Subject   st: propensity Score Matching
Date   Mon, 18 Oct 2004 11:19:46 -0400

weighted Ordered-Probit Adjusted Estimator of ATT, but I have noticed
that the standard errors increase slightly. I would like to know if it
is possible to get the variance-covariance matrix after do the matching.
I really don't know if I have to correct my dataset (or the standard
errors) in some sense after matching and before to use it for other
regressions.  What do you think??
I will appreciate if you can help me with this problem. 

Monica Ospina

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