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).
Frank
Assistant Professor (Educational Research and Evaluation)
Department of Education Sciences
European University-Cyprus
P.O. Box 22006
1516 Nicosia
Cyprus
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.lampria...@manchester.ac.uk
--
Frank E Harrell Jr Professor and Chairman School of Medicine
Department of Biostatistics Vanderbilt University
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