Stephanie Delalieux wrote: > Dear R-users, > > Is there a function in R that classifies data in more than 2 groups using > logistic regression/classification? I want to compare the c-indices of > earlier research (lrm, binary response variables) with new c-indices > obtained from 'multiple' (more response variables) logistic regression. > > Best regards, > Stephanie Delalieux > > Department Biosystems > M³-BIORES > Group of Geomatics Engineering > [EMAIL PROTECTED]
There are many functions available but the answer depends on whether the response variable has a natural ordering. Whether it does or not, though, C-indexes may decrease from the binary case because predicting more categories is a more difficult task. Frank Harrell > > > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html > -- Frank E Harrell Jr Professor and Chair School of Medicine Department of Biostatistics Vanderbilt University ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html