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st: log normal and logistic hazard ratio


From   <S.Jenkins@lse.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: log normal and logistic hazard ratio
Date   Mon, 20 Jun 2011 09:11:56 +0100

------------------------------

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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