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st: question on heckman


From   rghaz046@uottawa.ca
To   statalist@hsphsun2.harvard.edu
Subject   st: question on heckman
Date   Thu, 21 Feb 2008 15:38:07 -0500 (EST)

Hi,
I have a question on Mill's ratio and Heckman procedure. When I use Mill
ratio to take into account the possible endogeneity of one of my
explanatory variable, I get different result from what I get by using
regular IV. What can be the resaon (reasons) for that? The more basic
question is that what distinguishes using Mill ratio and regular IV?
I appreciate your help
Ryan

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