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Re: st: AW: How to compute sigma or sum


From   "Sergiy Radyakin" <serjradyakin@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: AW: How to compute sigma or sum
Date   Sat, 2 Feb 2008 15:04:53 -0500

Martin Weiss has shown an example where a new variable is created and
it's valuse for all observations are set to the sum of the values of
another variable. Although indeed this provides the desired sum, it is
rather inefficient in terms of both memory use and computational
performance.

To find a sum of the values of a variable, use

summarize x
display r(sum)

If need to reuse this value later in your program, store it in a local:
local sigma=r(sum)
display `sigma'

A number of other related statistics (min, max, sd) can be obtained in
a similar fashion. Type

return list

after summarize (or any other command) to see the results available.

Best regards, Sergiy

On 2/2/08, Martin Weiss <martin.weiss@uni-tuebingen.de> wrote:
> Try this:
>
> set obs 100
> range x 1 100
> egen sumofx=total(x)
>
>
>
> Martin Weiss
> _________________________________________________________________
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> -----Ursprüngliche Nachricht-----
> Von: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von adiwan fahlan
> Gesendet: Samstag, 2. Februar 2008 17:44
> An: statalist@hsphsun2.harvard.edu
> Betreff: st: How to compute sigma or sum
>
> Dear all
>
> I am a new STATA user.
>
> I want to ask how to compute sigma or sum
>
> thank you
>
>
>
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