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Re: st: when to use the heckman two step instead of the maximum likelihood heckman


From   nicola.baldini2@unibo.it
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: when to use the heckman two step instead of the maximum likelihood heckman
Date   Sun, 12 Aug 2007 15:05:50 +0200

No serious answers. But I like the test rho=0 that you can have at the botton of the ML version

Nicola

At 02.33 09/08/2007 -0400, "georg wernicke" wrote:
>Hello,
>
>I cannot find any rule regarding when I should use the heckman two
>step instead of the maximum likelihood heckman or vice versa.
>
>Any help is most appreciated. 
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