Re: st: RE: Question about cummulative summatories

[David Kantor <dkantor@jhu.edu>]

In response to Sirenia Vazquez's question about cumulative sum, and the 
reply that Gabi Huiber provided, I would like to add...

 egen y=sum(x)

will give the overall sum (a constant), whereas,

 gen y=sum(x)

will give the cumulative sum.

Either can be combined with -by- to partition the data into subsets.

--David

At 01:41 PM 7/29/2003 -0400, you wrote:

> if you have a variable x, and want another variable y=sum(x), then Stata 7's
>
> egen y=sum(x)
>
> will do it.
>
> Gabi
>
> -----Original Message-----
> From: Sirenia Vazquez [mailto:sirenia.vazquez@cide.edu]
> Sent: Tuesday, July 29, 2003 2:26 PM
> [...]
> There is a command in the spss program in which you can generate a new
> variable that is the cumulative summatory of the original variable (namely
> csum). I would like to know if there is a similar command or funcion in
> Stata,
> or if there is any other way I could create that new variable.
> Thank you.
> Sirenia Vazquez
David Kantor
Institute for Policy Studies
Johns Hopkins University
dkantor@jhu.edu
410-516-5404

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