st: Question about cummulative summatories

[Sirenia Vazquez <sirenia.vazquez@cide.edu>]

There is a command in the spss program in which you can generate a new 
variable that is the cumulative summatory of the original variable (namely 
csum). I would like to know if there is a similar command or funcion in Stata, 
or if there is any other way I could create that new variable. 
Thank you.
Sirenia Vazquez

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