On 13 Dec 2003 10:11:19 +0100
Christoph Lehmann <[EMAIL PROTECTED]> wrote:
> Hi
>
> Since the 'equal slope' assumption doesn't hold in my data I cannot use
> a proportional odds model ('Design' library, together with 'Hmisc'). I
> would like to try therefore a partial proportional odds model
>
> Please, could anybody tell me, where to find the code and how to specify
> such a model
>
> ..or any potential alternatives
>
> many thanks for your kind help
>
> christoph
> --
> Christoph Lehmann <[EMAIL PROTECTED]>
I do not know of an implementation of the partial PO model in S. You can
easily fit continuation ratio ordinal response models in S using lrm and
glm, with easy-to-construct non-equal slope components, after suitable
expansion of the dataset (see Regression Modeling Strategies, Springer
2001 for a detailed case study using lrm, with code).
Frank Harrell
---
Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
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