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st: heckprob or biprob and getting lamda terms


From   fatma bircan <[email protected]>
To   [email protected]
Subject   st: heckprob or biprob and getting lamda terms
Date   Tue, 07 Dec 2004 15:46:19 +0200

Hi, 

I am trying to estimate an earnings equation for self-employed and
employed. To eliminate the selection bias I intend to use a double
probit model. Stata seems to offer two commands for this task,
heckprob and biprobit. I am not sure which one I should use. 

Heckprob seems to be more appropriate for my model. But, in any case I
need to get two selection terms (lambda s) for my earnings equations.
With heckprob command I only get the rho term but lambdas. I can
neither add the main equation (earnings eq.) with heckprob command. 

Anyone familiar with the problem please write me.

Thank you





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