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The poTest function implements tests proposed by Brant (1990) for proportional odds for logistic models fit by the polr function in the MASS package.
poTest
polr
poTest(model, ...) # S3 method for polr poTest(model, ...) # S3 method for poTest print(x, digits=3, ...)
poTest returns an object meant to be printed showing the results of the tests.
a proptional-odds logit model fit by polr.
an object produced by poTest.
number of significant digits to print.
ignored.
John Fox jfox@mcmaster.ca
R. Brant, "Assessing proportionality in the proportional odds model for ordinal logistic regression." Biometrics 46: 1171--1178, 1990.
if (require("MASS")){ .W <- Womenlf .W$partic <- factor(.W$partic, levels=c("not.work", "parttime", "fulltime")) poTest(polr(partic ~ hincome + children + region, data=.W)) }
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