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bercedis
2009 Feb 24
1
polr (MASS): score test for proportional odds model
For the following model,
library(vcd)
arth.polr <- polr(Improved ~ Sex + Treatment + Age, data=Arthritis)
summary(arth.polr)
where Improved is an ordered, 3-level response I'm looking for a
*simple* way to test
the validity of the proportional odds assumption, typically done via a
score test
for equal slopes/effects over the predictors.
I do find a po.test= option in the repolr package