[R] Cox regression for prevalence estimates

Frank E Harrell Jr f.harrell at vanderbilt.edu
Tue Sep 7 14:27:34 CEST 2004

Bernardo Rangel Tura wrote:
> At , The Michaelson Institute wrote:
>> How can R be used to calculate the prevalence ratios using Cox 
>> regression +
>> robust variance estimates ?
> Well,
> In Design package have a command: cph
> This command have a option "robsut" with default=FALSE, but in help is 
> write:
> " ... robust if TRUE a robust variance estimate is returned. ..."
> I think that is your response...
> bye
> Bernardo Rangel Tura, MD, MSc
> National Institute of Cardiology Laranjeiras
> Rio de Janeiro Brazil

No, robust is an option to coxph, not cph.  cph uses 'after the fit' 
correction using the robcov or bootcov functions in Design.

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

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