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st: heckman selection model with endogenous covariates


From   "Rao, James" <James.Rao@agr.uni-goettingen.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: heckman selection model with endogenous covariates
Date   Thu, 8 Apr 2010 11:13:19 +0200

Dear users,

Am interested in estimating a lbor demand equation as follows:

ln_labor=alpha + b1_X + b2_treatment

Since some respondents do not use hired labor, i specify the probability of
using hired labor as:

prob(labor)=b3_Z + b4_treatment

and then estimate the two equations jointly following heckman selection
approach.

My concern is that the treatment variable in  both equations is potentially
endogenous. Anyone with an idea of how I can address this potential
endogeneity within the framework of heckman selection models?


==================================================
Rao E.O. James (Msc)
Research Associate/PhD Student

Department of Agricultural Economics and Rural Development
Georg-August University of Göttingen
Platz der Gottinger Sieben 5
37073 Göttingen, Germany.
 
Tell:+49-551-394443 (Office)
E-mail: jimrao2@yahoo.co.uk;  James.Rao@agr.uni-goettingen.de

Courage is not the absence of fear but the triumph over it ... so fear not to
fear ... but strive to overcome fear!



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