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Re: st: AGE at event occurrence as the time variable in mortality analysis rather than time between entry into follow up an event occurrence


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: AGE at event occurrence as the time variable in mortality analysis rather than time between entry into follow up an event occurrence
Date   Sun, 7 Sep 2008 07:49:12 +0100 (BST)

--- uri goldbourt <goldbu1@post.tau.ac.il> wrote:
> In an epidemiological study where we follow up very old individuals
> the importance of time till event (say, mortality) pales in
> comparison to the actual age of the individual when the endpoint
> event occurred. <snip> What is the accurate way to stset the data so
> that age at event(assuming of course it is included for each event)
> become the time variable?

Setting time is the easy part of your analysis: The age is nothing
other than the time elapsed since birth. In your case the problem is
left censoring: People could have experienced the event before entering
the study. As a consequence you have ended up with a selected sample
where the weaklings have already been weeded out. I have never done a
study where I had to deal with left censoring, so I don't remember if
Stata can do anything about that and my books are at the office.  

-- Maarten



-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


      
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