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st: twostep option heckman


From   Chiara Mussida <[email protected]>
To   [email protected]
Subject   st: twostep option heckman
Date   Wed, 27 Nov 2013 20:40:59 +0100

dear all,
if the heckman model for selection does not converge (not concave) the
option twostep allows getting consistent mle estimates. Are these
estimates reliable even if, as said, the model without the option
twostep does not converge?
Thanks for any kind of clarification.
Best
chiara

-- 
Chiara Mussida
Assistant Professor
Department of Economics and Social Sciences,
Università Cattolica del Sacro Cuore,
Piacenza (Italy)

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