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Re: st: log normal and logistic hazard ratio


From   "Yusvita Triwiadhian S." <07.5544@stis.ac.id>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: log normal and logistic hazard ratio
Date   Tue, 21 Jun 2011 08:48:23 +0700

thank you very much Mr.Stephen..

On Mon, Jun 20, 2011 at 3:11 PM,  <S.Jenkins@lse.ac.uk> wrote:
> ------------------------------
>
> Date: Mon, 20 Jun 2011 09:42:39 +0700
> From: "Yusvita Triwiadhian S." <07.5544@stis.ac.id>
> Subject: st: log normal and logistic hazard ratio
>
> dear all
>
> Lognormal and logistic distribution for survival anlysis,there isn't
> hazard ratio,is it right? why? i'm looking for command to get its
> hazard ratio but i do not get it..
>
> thank you
> ------------------------------
>
> There is no relevant "hazard ratio" in the sense that it is
> conventionally defined, because that definition refers to models that
> satisfy the proportional hazards property. (Examples include
> exponential, Weibull, Gompertz, and Cox's semi-parametric model.)
>
> The lognormal and logistic models do not satisfy the proportional
> hazards property. They are examples of Accelerated Failure Time models.
> For these one can look at "time ratios".
>
> The Stata manuals are clear on the distinction between different types
> of continuous time hazard regression models. Look under -st-.
>
> Stephen
> -------------------------------------
> Professor Stephen P. Jenkins  <s.jenkins@lse.ac.uk>
> Department of Social Policy and STICERD
> London School of Economics and Political Science
> Houghton Street, London WC2A 2AE, U.K.
> Tel. +44 (0)20 7955 6527
> Survival Analysis using Stata:
> http://www.iser.essex.ac.uk/survival-analysis
> Downloadable papers and software: http://ideas.repec.org/e/pje7.html
>
> Please access the attached hyperlink for an important electronic communications disclaimer: http://lse.ac.uk/emailDisclaimer
>
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