st: summing the values of all observations of a variable in Stata 8.2

[Suzy <scott_788@wowway.com>]

Hi Statamembers,

Is there an easy command  to sum the values of all observations of a 
variable. I've searched the internet for info, but haven't found 
anything yet.

For example:

ID        bmi
1            26
2            18
3            20

SUM bmi = 64

Thank you for the help!
Suzy
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