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st: instrumental variable heckman


From   Kidist Gebreselasie <wawuye@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: instrumental variable heckman
Date   Thu, 20 Mar 2008 05:03:05 -0700 (PDT)

Hi there,
Any idea  
1. how to run an instrumental variable Heckman in
STATA?
2. why the estimations (coefficients and standard
error) obtained from a manually conducted IV Tobit
differ from that obtained by running the STATA
built-in IVTobit model. By manual I meant: run OLS in
stage 1 and plug in the residuals from stage 1 in the
simple tobit model in stage 2) 

I would appreciate, please.

wawuye.
 


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