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Re: st: RE: running sum


From   Maximiliano Manuel Silva Correa <maxsilvacorrea@gmail.com>
To   statalist@hsphsun2.harvard.edu
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 <n.j.cox@durham.ac.uk>:
> bysort line (subst) : gen cum_power = sum(power)
>
> Nick
> n.j.cox@durham.ac.uk
>
> 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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