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st: nonlinear MLE estimate:results always come back to its initial value


From   Lizzy Zhang <lizzy1230@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: nonlinear MLE estimate:results always come back to its initial value
Date   Wed, 12 Dec 2012 15:45:11 -0500

Hi,

As I am doing an estimate of coefficients in a nonlinear model using
MLE, no matter what initial values I set, the results always come back
to its initial value. Is it more likely that there is something wrong
with my model, or with my code?
Thanks.

Lizzy
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