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Re: st: RE: running sum
From
Maximiliano Manuel Silva Correa <[email protected]>
To
[email protected]
Subject
Re: st: RE: running sum
Date
Wed, 4 Aug 2010 11:14:48 -0400
That works perfect!!! Thank you Nick
2010/8/4 Nick Cox <[email protected]>:
> bysort line (subst) : gen cum_power = sum(power)
>
> Nick
> [email protected]
>
> Maximiliano Manuel Silva Correa
>
> Im stuck trying to do a running sum using by. My problem is like:
>
> 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
>
> For instance,
>
> LINE SUBST POWER CUM_POW
> 1 1 10 10
> 1 2 20 30
> 1 3 15 45
> 1 4 5 50
>
> how goes the sintaxis for that?
>
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