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st: summation

From   Arina Viseth <arina@UDel.Edu>
Subject   st: summation
Date   Tue, 11 Aug 2009 10:55:42 -0400 (EDT)

Dear Statalist,

I imported from excel quarterly data for three variables, from 1995 to 2008. 

It currently looks like this on Stata:
var A                    var B            var C
1995Q1 1995Q2...2008Q4 |1995Q1 ...2008Q4| 1995Q1...2008Q4 

I would like to generate the sum all three variables for the same quarterly data, and I am not sure how to proceed. Would there a quick way for me to do?  

Thank you very much in advance for any suggestion.

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