I am running R 1.8.1 on a Windows platform
I am attempting to fit an ordinal logistic regression model, using the polr function, as described in Venables and Ripley. But when I try
model4 <- polr(ypsxcat~committed + as.factor(sex) + as.factor(drugusey) + anycsw + as.factor(sex)*committed + as.factor(sex)*as.factor(drugusey)+as.factor(sex)*anycsw, data = duhray)
I get a message that the polr function was not found.
Load the MASS package prior to calling polr().
library(MASS)
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