[R] ordinal regression
Frank E Harrell Jr
f.harrell at Vanderbilt.Edu
Wed Mar 24 16:29:07 CET 2010
Iasonas Lamprianou wrote:
> Dear colleagues,
> i am carrying out an ordinal regression model. I try it on SPSS but I "flirt" with R as well. I have a few questions.
> 1. What is the most reliable/tested/trusted package for ordinal regression in the R world?
> 2. Also, I have a statistical question. What is the danger of having to many 'empty cells' in ordinal regression? How many empty cells are too many? Do you have a reference for me to read?
> Thank you for the support
> Dr. Iasonas Lamprianou
Not sure what is the most trusted but the lrm function in the rms
package does proportional odds and continuation ratio models (the latter
with a trick to expand the dataset). Nearly empty cells are not a
problem unless you allow for non-proportionality (e.g., interaction
between X and Y).
> Assistant Professor (Educational Research and Evaluation)
> Department of Education Sciences
> European University-Cyprus
> P.O. Box 22006
> 1516 Nicosia
> Tel.: +357-22-713178
> Fax: +357-22-590539
> Honorary Research Fellow
> Department of Education
> The University of Manchester
> Oxford Road, Manchester M13 9PL, UK
> Tel. 0044 161 275 3485
> iasonas.lamprianou at manchester.ac.uk
Frank E Harrell Jr Professor and Chairman School of Medicine
Department of Biostatistics Vanderbilt University
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