Hello I would like to compare the results obtained with a classical non parametric proportionnal hazard model with a parametric proportionnal hazard model using a Weibull. How can we obtain the equivalence of the parameters using coxph(non parametric model) and survreg(parametric model) ? Thanks Virginie
(no subject)
3 messages · Virginie Rondeau, Göran Broström, Frank E Harrell Jr
On Thu, Jan 20, 2005 at 03:18:53PM +0100, Virginie Rondeau wrote:
Hello I would like to compare the results obtained with a classical non parametric proportionnal hazard model with a parametric proportionnal hazard model using a Weibull. How can we obtain the equivalence of the parameters using coxph(non parametric model) and survreg(parametric model) ?
One way of avoiding this problem is to fit the Weibull model with 'weibreg' in the package eha.
G?ran Brostr?m tel: +46 90 786 5223 Department of Statistics fax: +46 90 786 6614 Ume? University http://www.stat.umu.se/egna/gb/ SE-90187 Ume?, Sweden e-mail: gb at stat.umu.se
Virginie Rondeau wrote:
Hello I would like to compare the results obtained with a classical non parametric proportionnal hazard model with a parametric proportionnal hazard model using a Weibull. How can we obtain the equivalence of the parameters using coxph(non parametric model) and survreg(parametric model) ? Thanks Virginie
In the Design package look at the pphsm function that converts a survreg Weibull fit (fitted by the psm function which is an adaptation of survreg) to PH form.
Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University