[R] likelyhood maximization problem with polr

[blackscorpio]

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
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