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Re: st: Centering on age for -stcox-


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Centering on age for -stcox-
Date   Fri, 26 Sep 2008 21:34:36 +0100 (BST)

--- Michael McCulloch <mm@pinest.org> wrote:
> At the bottom of that page, I read that this can be resolved by 
> subtracting mean age from each subject's age. I wish to do this 
> within a short program. How would I write a command that subtracts 
> the mean from age for each observation?

*--------------- begin example ----------------
sysuse cancer, clear
sum age if !missing(studytime, died, drug)
gen c_age = age - r(mean)
*---------------- end example -----------------
(For more on how to use examples I sent to the Statalist, see
http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )


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

visiting address:
Buitenveldertselaan 3 (Metropolitan), room N515

+31 20 5986715

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


      
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