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st: mean of variables

From   "Andrea Rispoli" <>
Subject   st: mean of variables
Date   Thu, 22 May 2008 18:15:33 +0200

Dear Statalist Members,
I would like to know how to build mean variables in Stata.
To be more specific, suppose that I have three columns/variables
indicating sales in 3 different years for each observation, and I'd
like to build a fourth column which contains the mean of sales in the
three years for each observation.
Could you please indicate me the code? (I have already checked in the
manual but I could not find anything that helped me)
Thank you very much
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