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Re: st: running sum

From   Maarten buis <>
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 L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen


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