Re: [R] parametric proportional hazard regression

From: Valentin Dimitrov <vsdimitrov_at_yahoo.com>
Date: Sat 08 Jul 2006 - 22:24:05 EST

> That will be a very strange model that I've never
> seen used before in
> survival analysis. Interpretation of parameters
> other than the hazard
> ratio may be tricky. Why do you need a
> nontraditional model such as this?
>
> Frank
>
> --
> Frank E Harrell Jr Professor and Chair
> School of Medicine
> Department of Biostatistics
> Vanderbilt University
>

I am new to the field of survival analysis and my first text read on that topic is Franses/Paap, Quantitative Models in Marketing Research, Chapter 8. There the kind of models I describe are the standard proportional hazard models. But also in Internet I find texts which say something about parametric PH models, where the baseline hazard can take some specific form! See for instance:
http://www.weibull.com/AccelTestWeb/proportional_hazards_model.htm The second part reads "parametric PH models" and there is an example with the Weibull baseline distribution. The log-likelihood is derived, too. The same could be done with the other distributions I mentioned (lognormal, loglogistic, exponential).
Anyway, if you say these models are untraditional, then maybe there is also no R-function for them... In that case I'll write a R-code myself to fit them using ML.

Kind regards,
Valentin



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