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st: Cumulative sum


From   "de la Garza, Adrian" <[email protected]>
To   <[email protected]>
Subject   st: Cumulative sum
Date   Fri, 30 Apr 2004 16:51:07 -0400

Hello everyone.

I would like to create a variable that gives me the cumulative of an
amount by country, like so:

country	year	quar	amount	cum_amount
Argentina	1990	1	100		100
Argentina	1990	2	50		150
Argentina	1990	2	25		175
Argentina	1990	2	100		275
Argentina	1990	3	200		475
...
Bolivia	1990	1	25		25
Bolivia	1990	1	30		55
...

Does anyone know a command that would do this without needing to write a
loop?

Thank you!
Adrian

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