[R] likelyhood maximization problem with polr

[tjb]

blackscorpio wrote:
> 
> Dear community,
> 
> I am currently trying to fit an ordinal logistic regression model with the
> polr function. I often get the same error message :
> 
> "attempt to find suitable starting values failed", for example with :
> ...
> Does anyone have a clue ?
> 

Yes. The code that generates a starting value for the optimization is
flakey. lrm in the Design library appear to be more robust.
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