[R] Likelihood Optimization With Categorical Variables

Dr. Federico Andreis federico.andreis at gmail.com
Fri Mar 12 18:56:03 CET 2010

Dear all,

I have the following problem:

I have been using the routine "optim" in order to maximize a joint
likelihood (basically a mixture with modeled weights) with quantitative
variables..so far so good.

Now I need to plug into the model a categorical variable (namely, age

Obviously, given the way optim works, it won't allow me to treat it
"directly" (i.e. just plugging it in with a single parameter).

I would like to avoid having to construct some heavy ifelse structure inside
the function to be passed to optim, that would be quite inefficient..

Do you have any suggestion? Any other routine which could deal with
categorical (along with non categorical) variables without for the aim of

thanks in advance

Federico Andreis
Università degli Studi di Milano Bicocca, PhD Student
MEB, Karolinska Institutet, Visiting PhD Student
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