[R] Multiple logistic regression

Frank E Harrell Jr f.harrell at vanderbilt.edu
Wed Mar 8 15:30:17 CET 2006

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
> Group of Geomatics Engineering
> stephanie.delalieux at biw.kuleuven.be

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

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Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University

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