search for: tonsiles

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2006 May 03
1
Problem in using confint method on polr model object
...te confidence intervals for the parameters I get the following error message Waiting for profiling to be done... Re-fitting to get Hessian Error in X[, -i, drop = FALSE] : incorrect number of dimensions Can someone explain the error-message? (The data are from McCullagh (1980), JRSS,B) tonsiles<-data.frame(carrier=factor(rep(c('yes','no'),each=3)), size=ordered(rep(c(1,2,3),2)), count=c(19,29,24,497,560,269)) library(MASS) m<-polr(size~carrier,data=tonsiles,weights=count) confint(m) Ulrich platform i386-pc-mingw3...