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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...
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...
Note that that the enhancements in my original post solve the unresolved problem of Chaehyung Ahn (22 Mar 2005) whose data I reproduce: y,x,lx 0,3.2e-02,-1.49485 0,3.2e-02,-1.49485 0,1...
The start value generation code in polr is also known to fail quite frequently. For example, against the Iris data as recently posted to this list by blackscorpio ( Sep 6, 2010). > polr(Species~Sepal_Length+Sepal_Width+Petal_Length+Petal...
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