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st: Centering on age for -stcox-


From   Michael McCulloch <mm@pinest.org>
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   st: Centering on age for -stcox-
Date   Fri, 26 Sep 2008 13:23:51 -0700

Hello,
In studying the manual (v9, page 147) section on the Technical Note for Example 7 of -stcox-, I read that specifying the baseline hazard option requires all variables to make sense if they would be equal to zero (which of course would not be the case with a variable such as age). That makes sense to me.

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?



Michael
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