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st: sample selection with bivariate probit


From   Abdurrahman.Aydemir@statcan.ca
To   statalist@hsphsun2.harvard.edu
Subject   st: sample selection with bivariate probit
Date   Thu, 26 Sep 2002 13:07:31 -0400

Dear Users,

I am estimating a log earnings equation controlling for selection. The
selection involves two stages that leads to a bivariate probit with partial
observability. 

lnw=x3b3+e3 observed for z=1 and z=0

where z=y1 x y2; z=1 iff y1=y2=1; z=0 if y1=0 or y2=0

y1i=1 if y1i*=x1b1+e1>0; 0 o.w.
y2i=1 if y2i*=x2b2+e2>0; 0 o.w.
 Only the outcome of z observed (neither y1 nor y2 are observed). 

Is there any program/ado file in Stata that will estimate the earnings
equation for z=1 and z=0 and report the correct standard errors?

Thanks very much,

Abdurrahman Aydemir

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