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st: Propensity Score Matching (PSM) - matching problem


From   umut senalp <uerksan@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Propensity Score Matching (PSM) - matching problem
Date   Thu, 6 Sep 2012 02:40:27 +0300

Dear Statalisters,
I am currently working with a panel containing around 9.000 firms and
trying to evaluate the exports effects on firm-level productivity, and
I use Matching approach (Propensity Score Matching) to get the
treatment/export effects (on treated - ATT).
I use -psmatch2.ado- (writen by Edwin Leuven and Barbara Sianesi) 
I already matched the exporters with non exporters. However, I am
having some problems with the application of the method. The problem 
is PSM procedure allows the PSM algorithm to match
a treated firm with a treatment-group firm (and sometime itself) 
after the treatment is over, by considering
treated firmsafter treatment as if they were control firms.
What I would like to ask is if is there any solution about the problem.
I would be glad if you could provide me a hint on this issue.
Kind regards 		 	   		  
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