[R] setting contrasts for a logistic regression

[w_poet]

Hi everyone,

I'm doing a logistic regression with an ordinal variable. I'd like to set
the contrasts on the ordinal variable. However, when I set the contrasts,
they work for ordinary linear regression (lm), but not logistic regression
(lrm):

ddist = datadist(bin.time, exp.loc)
options(datadist='ddist')
contrasts(exp.loc) = contr.treatment(3, base = 3, contrasts = TRUE)
lrm.loc = lrm(bin.time ~ exp.loc, data = Dataset)

In this case, lrm still uses exp.loc = 1 as the base, at least in terms of
notation, even though I set exp.loc = 3 as the base.

Is there a way to set contrasts for lrm?

Thanks for any advice,
Stephen


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