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Re: st: creating a cumulative variable


From   Sarah Mustillo <smustillo@psych.mc.duke.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: creating a cumulative variable
Date   Thu, 11 Jul 2002 14:11:33 -0400

Nick and Nick -

I implemented your solution to my cumulative variable problem, which worked very nicely, thank you very much. Beyond that, however, I wanted to thank you for pointing me towards the "foreach" command. I can't believe I have never used this before! Already it has simplified my life tremendously. Thank you.

Sincerely,

Sarah















foreach v of var <varlist> {
	by id : gen C`v' = sum(`v')
}

You must plug in your <varlist>. It can be in abbreviated form,
using * ? and/or -, etc.

Naturally, you can use your own naming convention, but
this is usually easiest with just some short prefix or suffix
added to the original variable name to give a new name.

This particular problem can also be done with -for-.
My main reservation about -for- is that it doesn't
grow gracefully when extended to more complicated
problems, whereas -foreach- typically does.

Nick
n.j.cox@durham.ac.uk

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Sarah Mustillo, Ph.D
Center for Developmental Epidemiology
Department of Psychiatry and Behavioral Sciences
Duke University Medical Center

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