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st: cumulative adding


From   "Jonathan A. Schwabish" <jschwabi@yahoo.com>
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   st: cumulative adding
Date   Wed, 21 Sep 2005 17:30:54 -0700 (PDT)

I'm sure this is an easier task than I'm making it out
to be but I'm trying to create a cumulative tally of a
binary variable. To illustrate, my data set has the
variable 'X' and I'd like to create the 'sumX'
variable: 

'X' 'sumX'
 0    0
 1    1
 1    2
 1    3
 0    3
 1    4

I've tried writing a simple macro but can't get the
thing to work. Any suggestions?

Thanks,
Jon Schwabish

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