Re: [S] Proportional odds model

Frank E Harrell Jr (
Thu, 1 Oct 1998 09:20:13 -0400

The proportional odds model is due to Walker & Duncan (1967 Biometrika) although there are other relevant papers dating back to the
1930s. You can fit this model with the lrm function in the Design library (see web site below or statlib). The discrete
proportional hazards model is the continuation ratio ordinal logistic model, which can also be fit using lrm. See my article in
Statistics in Medicine, April 1998. Note that Design requires the Hmisc library also.
Frank E Harrell Jr
Professor of Biostatistics and Statistics
Division of Biostatistics and Epidemiology
Department of Health Evaluation Sciences
University of Virginia School of Medicine

-----Original Message-----
From: Arisman Adnan <>
To: <>
Date: Thursday, October 01, 1998 7:41 AM
Subject: [S] Proportional odds model

>Dear all,
>Does anyone know an available function in Splus for ordinal logistic
>regression using:
> proportional odds model
> proportional hazard model
>(McCullagh, 1980)
>I am using Splus Version 3.4 Release 1 for DEC alpha, unix.
>Thank you!
>Postgraduate Student
>Univ. of Newcastle
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