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st: ML estimation and gradient


From   "Francesca Foliano" <francescafoliano@hotmail.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: ML estimation and gradient
Date   Mon, 20 Aug 2007 10:22:32 +0100

Dear all,

I would like to know why, when using maximum likelihood estimation in Stata, the gradient in the last iteration is often numerically different from zero whereas it should be theoretically equal to zero.

Thanks.
Francesca

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