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st: Altonji, Elder, and Taber (2005) Selection on Observed and Unobserved Variables


From   NOAM MANO <kokovianey@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Altonji, Elder, and Taber (2005) Selection on Observed and Unobserved Variables
Date   Fri, 23 Dec 2011 23:26:56 -0500

Der all
I need help for estimation treatment effect using Altonji, Elder, and
Taber (2005)  approach (Selection on Observed and Unobserved
Variables: Assessing the Effectiveness of Catholic Schools)
Especially how to constraint the correlation.
Thanks
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