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st: Cumulative Sum by groups


From   "Alexander Nervedi" <alexnerdy@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Cumulative Sum by groups
Date   Fri, 22 Apr 2005 14:13:34 +0000

Hi

I am looking to implement a group level cumulative sum that starts counting backwards. Any suggestions on how to go about this would be really useful

data example:
ID year num cusum
1 90 1 2
1 91 1 1
2 90 1 4
2 91 1 3
2 92 1 2
2 93 1 1
3 90 1 1
4 90 1 2
4 90 1 1
...

I have variables ID year and num, and am trying to create cusum

thanks

-AN

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