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