---------- Forwarded message ----------
From: HSIUTZU CHANG <[email protected]>
Date: Wed, Jul 29, 2009 at 2:48 PM
Subject: calculate the average by subgroup for a panel dataset
To: [email protected]
Dear Stata users:
How can I calculate the average of serveral variables by the subgroup
of another variable?
I have a panel dataset of property sale price information and I need
to calculate the average of the sale prices (s1, s2, s3) by zipcode
area (zip).
Since there are missing values in my dataset, I have tried using a
command suggested from an eariler thread
http://www.stata.com/statalist/archive/2007-02/msg00143.html
egen ave= rmean(s1-s3)
but this command only calculate the average of s1-s3 for each record.
In order to calculate the average of s1-s3 by zip, I tried:
bysort zip: egen ave2= rmean(s1-s3)
I got an error messaging saying
" egen ... rowmean() may not be combined with by
r(190)"
I am a beginer to STATA, so any suggestions will be welcome!
Thank you
Betty
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