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st: RE: problems with gllamm


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: problems with gllamm
Date   Wed, 10 Dec 2008 20:34:28 -0000

-gllamm- couldn't fit your model and is advising you to think about what
you are asking. The usual advice is to try a much simpler model and
build up. 

Nick 
n.j.cox@durham.ac.uk 

Josep Maria Raya

I'm trying to estimate a mixed multinomial logit, but when I use this  
command (gllamm) in this form:

gllamm motivacioport sexe dedat1-dedat5  
dprocedencia_new2-dprocedencia_new5 usuariplatja dambqui1 dambqui2  
dtransport1-dtransport3, expand( id chosen m) i(proc)  link(mlogit)  
family(binom) nrf(4) eqs(a2 a3 a4 a5) nip(4) trace

I obtain this error message:
"could not calculate numerical derivatives
missing values encountered
(error occurred in ML computation)
(use trace option and check correctness of initial model)"

Any solution or the problem is that there is not solution?

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