st: Centering on age for -stcox-

[Michael McCulloch <mm@pinest.org>]

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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