Dea all, Let's suppose I am studying a questionnaire survey and one of the questions has three ordered categorical responses (say, A, B and C). Eg
result<-ordered(c(rep("A",12),rep("B",37),rep("C",6))) Assume the respondents are not grouped. The differences between the subsequent levels can be, I think, modeled with polr: fit<-polr(result~1) summary(fit) Could you please explain me what do the coefficients from the above summary mean? And how I could use the t-test (eg, what are degrees of freedom, for example? What is the exact hypothesis being tested here?)? Thank you, Stats Wolf ______________________________________________ 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.