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st: RE: instrumental variable heckman


From   "Patrick Richard" <p_richar2@berkeley.edu>
To   <statalist@hsphsun2.harvard.edu>
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.

Thanks,

Patrick

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Kidist
Gebreselasie
Sent: Thursday, March 20, 2008 5:03 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: instrumental variable heckman

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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