Re: st: Summing variables over all observations by identifier

[Philipp Rehm <Philipp.Rehm@gmx.de>]

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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