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einrichtung
2003 May 28
2
Ordinal data - Regression Trees & Proportional Odds
I have a data set w/ an ordinal response taking on one of 10 categories.
I am considering using polr to fit a cumulative logits model. I
previously fit the model in SAS (using proc logistic) which provides a
test for the proportional odds assumption (p < 0.001 for the test). Are
there simple diagnostic plots that can be used to look at the validity
of this assumption and possibly help w/