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Re: st: Centering on age for -stcox-

From   Michael McCulloch <[email protected]>
To   [email protected]
Subject   Re: st: Centering on age for -stcox-
Date   Fri, 26 Sep 2008 13:58:38 -0700

Thanks Maarten.

--- Michael McCulloch <[email protected]> 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 )

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

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