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


From   "georg wernicke" <georg.wernicke@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: when to use the heckman two step instead of the maximum likelihood heckman
Date   Wed, 8 Aug 2007 12:56:33 +0100

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.

Thank you very much

With kind regards,

Georg Wernicke
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