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 -- View this message in context: http://old.nabble.com/setting-contrasts-for-a-logistic-regression-tp26347831p26347831.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
