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st: Maximum likelihood solution
I am running a maximum likelihood program (method lf) but I an having
problems achieving convergence. The model pass 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 missing values
I have tried changing ltol and tol but that doesn't help. I have also
specified the initial values but that doesn't work either.
Any advice will be highly appreciated.
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