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st: biprobit with sample selection


From   chen jie <uuphd2002@yahoo.com.cn>
To   Stata <statalist@hsphsun2.harvard.edu>
Subject   st: biprobit with sample selection
Date   Sun, 6 Mar 2005 14:26:04 -0800 (PST)

Dear Statalists

Is possible to combine biprobit with sample selection
in Stata? 

I want to estimate a model:

(1) y1=P(Y1=1)=aX1+bY2+e
(2) y2=P(Y2=1)=cX2+v

Eq(1): Y1 is the binary choice outcome (exit or
remain) for a welfare recipint sample. Y2 is binary
dummy explanatory variable (married or single) in (1)
but could be endogenous to Y1. I want to address the
endogeneity issue of Y2 in eq (1). So I use the
biprobit model. 

But the complex issue is when I estimate equation (2)
only among welfare recipents, it has a sample
selection issue should be addressed by Hekcman
selection model. 

So I wonder how to combine biprobit with sample
selection in Stata. 

Thanks so much for any help!
  

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