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st: Adding cumulatively


From   "rmjohn@gmail.com" <rmjohn@gmail.com>
To   stata <statalist@hsphsun2.harvard.edu>
Subject   st: Adding cumulatively
Date   Fri, 16 May 2008 07:38:51 -0700

Hi I have a data as follows.

Year  ID  var1 var2
1       1     4    6
2       1     5    8
3       1     2    2
4       1     3    7
1       2     5    1
2       2     7    5
3       2     6    4
4       2     4    9

I need cumulative sums of var1 and var2 by ID

so that it will become

Year  ID  var1 var2 cumvar1 cumvar2
1       1     4    6        4          6
2       1     5    8        9         14
3       1     2    2       11        16
4       1     3    7       14        23
1       2     5    1        5          1
2       2     7    5       12         6
3       2     6    4       18       10
4       2     4    9       22       14


I have more than two vars. Can some one please help.

Thanks.
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