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| From | Maarten buis <maartenbuis@yahoo.co.uk> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: running sum |
| Date | Wed, 4 Aug 2010 15:03:31 +0000 (GMT) |
--- On Wed, 4/8/10, Maximiliano Manuel Silva Correa wrote:
> Suppose we have serveral power distribution lines (composed
> of serveral substations) all around the states. Suppose our
> variables are LINE SUBST POWER
>
> I want to generate a variable CUM_POW containing the
> cummulative sum of POWER by LINE SUBST
bys LINE (SUBST) : gen CUM_POW = sum(POWER)
Within each line, Stata sorts on SUBST, and the -sum- function
returns the running sum.
Hope this helps,
Maarten
--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany
http://www.maartenbuis.nl
--------------------------
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