I've run an ordered logistic regression model in R with Zelig and am looking to calculate predicted probabilities. Zelig has a series of simple one line commands to generate the information I want on first differences and so forth. Unfortunately, I keep getting an error when running the zelig function and was wondering if there was a quick alternative for generating predicted probabilities for a ordered logit in R. library(Zelig) mod <- zelig(sold ~ age + gender + marital + educ2 + cars + license + credit + type + home + id, model="ologit", data=dat, Hess=TRUE) summary(mod) For what it's worth, here's the error from my Zelig code.> x.out <- setx(mod, credit=1)Error in dta[complete.cases(mf), names(dta) %in% vars, drop = FALSE] : incorrect number of dimensions Can anyone tell me what I might be doing wrong. If not, can you give me an alternative solution that I can use to generate the probabilities. -- *Abraham Mathew Statistical Analyst www.amathew.com 720-648-0108 @abmathewks* [[alternative HTML version deleted]]