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st: calculating means over time


From   "Maureen Paul" <M.Paul@warwick.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: calculating means over time
Date   Mon, 21 Oct 2002 17:22:34 +0100

Hi 
I am trying to efficiently generate the mean of a few variables for
each individual over time. I have done the following but it does not
seem to do what I intend. Can anyone help me out here? Thanks. So just
to make the problem clearer, I have a panel of individuals and would
like to calculate for each individual over time, the mean of, say, age
wage and number of children.

mac def y "age wage children"
for var $y: by(pid): egen sumX=sum(X)
for var $y: egen zX=mean(sumX)

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