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st: Maximum likelihood convergence
I am running a maximum likelihood program (method lf) and I
problems achieving convergence. The model passes all the
tests of ml check
but then when I use ml max (or ml max, difficult) it stops
and gives the
following message "could not calculate numerical derivatives
encountered". In my program when I use generate I specify
double as recommended by Gould and Sribney, but that isn't
solving the problem.
I have tried changing ltol and tol but that doesn't help. I
specified the initial values but that doesn't work either.
Any advice will be highly appreciated.
Thanks in advance
Agricultural and Resource Economics
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