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Re: st: Summing variables over all observations by identifier


From   Philipp Rehm <Philipp.Rehm@gmx.de>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Summing variables over all observations by identifier
Date   Tue, 09 May 2006 20:08:46 +0200

bys ID: egen SumByID=sum(A)

HTH,
Philipp

Amber Katz wrote:
Hi,

I'm looking for a function that will sum a variable across all
observations by identifier.

For example, if I have

ID  A
1   1
1   0
2   1
2   2

I would like a function that would give me:
SumByID=function(A,ID)

SumbyID would be equal to 1 for all observations with ID=1 and 3 for
all observations with ID=2 .

Thanks very much,
Rachel

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