[R] likelyhood maximization problem with polr

[tjb]

blackscorpio wrote:
> 
> Thank you for your answer. I have already tried lrm and it's true that it
> works better than polr in such a case. Nevertheless lrm does not work with
> the addterm and dropterm functions (to my knowledge) and I need to use
> them. Maybe do you know alternate functions that would do the same job and
> that would work with lrm ?
> Many thanks
> 

I don't know of an exact equivalent. fastbw(Design) will do backwards
elimination for an lrm model.
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