I am learning R via a textbook that performs analysis with SPSS and SAS. In
trying to reproduce the results for an ordinal logit model, I get very
similar point estimates for my cut-off points, but the parameters for the
covariate q60 do not match. The estimate for q51 also matches. Is this
because I need to change a base case for the ordered covariate q60? Can this
be done in or is it always the first case?
mod<-polr(as.ordered(q43j)~as.ordered(q60)+q51, method="logistic")
Perhaps a book using R would be a better idea, but it's the content and
price (free) of this book that I like.
Thanks a lot,
Ben
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