[R] polr (MASS): score test for proportional odds model
friendly at yorku.ca
Wed Feb 25 00:30:51 CET 2009
For the following model,
arth.polr <- polr(Improved ~ Sex + Treatment + Age, data=Arthritis)
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
for equal slopes/effects over the predictors.
I do find a po.test= option in the repolr package for repeated measures,
but for my
(tutorial) purposes this is too complex. Did I miss something simpler?
Michael Friendly Email: friendly AT yorku DOT ca
Professor, Psychology Dept.
York University Voice: 416 736-5115 x66249 Fax: 416 736-5814
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