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st: convergence of ML


From   feldman@primal.ucdavis.edu
To   statalist@hsphsun2.harvard.edu
Subject   st: convergence of ML
Date   Wed, 28 Apr 2004 07:45:13 -0700

I am trying to run a ML model but I cannot make it work for
the data set that I am using. I know that the program works
since I checked it with other data set and it ran without
problems. 

I keep getting the message:
initial:       log likelihood =     -<inf>  (could not be
evaluated)
could not find feasible values

I have tried ml search to find better values but I get the
same message, and ml plot tells me that all log likelihood
values are missing. I have tried giving initial values based
on an alternative model and ml max, difficult but nothing
works. Any suggestions? Is it possible to have a data set
for which you cannot make   ml max work no matter what you
do?  

Thanks, 

Alejandro 

Alejandro Lopez-Feldman
Ph.D. Candidate
UC DAVIS
Agricultural and Resource Economics
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