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st: egen(more) panel data MA by group/year


From   Steven Archambault <archstevej@gmail.com>
To   n.j.cox@durham.ac.uk, statalist@hsphsun2.harvard.edu
Subject   st: egen(more) panel data MA by group/year
Date   Mon, 17 Aug 2009 13:27:58 -0600

Hi all,

I am trying to get a moving average for a group of observations, per
year, in my panel data. The data observations are individuals, each
with an ethnicity. I want to get the yearly average income of those
individuals by ethnicity.

Essentially, I am trying to do this:

egen inc_avg = ma(income), by(ethnicity)

Stata does not seem to allow -by- for -ma-

I also tried

egen inc_avg = ma(income), by(ethnicity) & (year)

Stata doesn't allow & in this context.

Any suggestions?

Thanks,
Steve
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