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st: Survival Analysis Censoring stset


From   Dirk Volland <vollanddirk@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Survival Analysis Censoring stset
Date   Thu, 18 Sep 2008 16:28:59 +0300

Hello,

i have to quesitons regarding censoring and how it is handled in
Stata's survival package.

(1) When I have the following data structure:

 id | year0 | year1 | failure

stset with the command

stset year1, id(id) failure(failure)

and year0 and year1 always represents a time span as 2006 and 2007
without gaps. Is this data interval censored just because it is
discrete and the failure event can only be measured at year1 meaning
the exact time between year0 and year1 is not available? Is this
handled by Stata in an appropriate manner?

(2) When I stset data with the command

stset year1, id(id) origin(time founding) enter(time start)

Here founding contains the time when the subject first came at risk
and start contains the time the observation window starts. So in a way
I know when a company was founded, but I want to start analysis in a
certain year. Are these observations still left censored? Is this
handled by Stata?

Thanks for any help,

best wished,

dirk

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