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st: RE: instrumental variable heckman

From   "Patrick Richard" <>
To   <>
Subject   st: RE: instrumental variable heckman
Date   Thu, 20 Mar 2008 10:29:37 -0700

Dear All,

I want to second the attached request regarding Heckman selection with IV.



-----Original Message-----
[] On Behalf Of Kidist
Sent: Thursday, March 20, 2008 5:03 AM
Subject: st: instrumental variable heckman

Hi there,
Any idea  
1. how to run an instrumental variable Heckman in
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.


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