I fit a proportional odds model
with the polr-function of the MASS package from
Venables and Ripley
Applying the confint method to calculate 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-mingw32
arch i386
os mingw32
system i386, mingw32
status
major 2
minor 3.0
year 2006
month 04
day 24
svn rev 37909
language R
version.string Version 2.3.0 (2006-04-24)
Ulrich Halekoh
Danish Institute of Agricultural Sciences
Unit of Statistics and Decision Analysis
Denmark
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