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Re: st: hazard function


From   "Stephen P. Jenkins" <stephenj@essex.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: hazard function
Date   Wed, 19 Feb 2003 14:24:51 +0000 (GMT Standard Time)

On Wed, 19 Feb 2003 03:00:57 -0800 (PST) alfonsomirand4@yahoo.com wrote:
 
> In stata 7 we can obtain the K-M non-parametric graph
> of a survival function. But i have not found yet how
> to obtain a graph of the hazard. Can you help me?

I presume you are referring to a hazard option within -st-.
The problem is that the hazard rate is problematic in principle to 
estimate from continuous time spell data. Hence no option. The standard 
approach is instead to estimate a smoothed hazard rate, using a kernel 
estimator. See, inter alia, Klein and Moeschberger /Survival Analysis/ 
for a discussion of issues.
There are user-provided version 7 programs for smoothed hazards. Type 
-findit sthaz- and -findit sthaz-.  (In fact a -findit hazard- would 
have found them.)  Stata version 8 has the option built-in.

The alternative is to impose some grouping on the data and estimate a 
hazard using -ltable-


Stephen
----------------------
Professor Stephen P. Jenkins <stephenj@essex.ac.uk>
Institute for Social and Economic Research (ISER)
University of Essex, Colchester, CO4 3SQ, UK
Tel: +44 (0)1206 873374. Fax: +44 (0)1206 873151.
http://www.iser.essex.ac.uk

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