Re: [R] methods for interval-censored data

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Subject: Re: [R] methods for interval-censored data
From: A.J. Rossini (rossini@blindglobe.net)
Date: Wed 20 Sep 2000 - 02:00:37 EST 

Message-ID: <87aed41ie2.fsf@jeeves.blindglobe.net>

>>>>> "EP" == Emmanuel Paradis <paradis@isem.univ-montp2.fr> writes:

EP> Dear all, Are there functions or packages in R that can handle
EP> interval-censored data? I have looked in various packages
EP> (such as survival5 or event), but it seems that only
EP> right-censored data can be analysed.

What do you want to do? 1-sample? regression models? hypothesis
testing? This isn't clear.

Also, what assumptions are you referring to? Continuous examination
process, or discrete examination process?

There aren't clear choices for fitting -- for the semiparametric
regression models, the properties of the many approaches for variance
estimation for regression parameters aren't well understood.

For parameteric models, Jim gave the answer and has a paper detailing
the characteristics of the approaches (Jim - did you ever publish
this?)

EP> More generally, are there methods to analyse both
EP> interval-censored observations and right-censored observations
EP> in the same data set?

All right censored observations are inherently interval censored, take
the interval (C,\infty).

best,
-tony 

-- 
A.J. Rossini				Rsrch. Asst. Prof. of Biostatistics
BlindGlobe Networks (home/default)	rossini@blindglobe.net	
UW Biostat/Center for AIDS Research	rossini@u.washington.edu	
FHCRC/SCHARP/HIV Vaccine Trials Net	rossini@scharp.org

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