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# st: AW: calculate the average by subgroup for a panel dataset

 From "Martin Weiss" To Subject st: AW: calculate the average by subgroup for a panel dataset Date Wed, 29 Jul 2009 16:10:13 -0400

```<>

You would probably be better -reshape-ing the data to long form. See

******
help reshape
******

under "Remarks". Then you can indeed apply -bysort- to your problem...

HTH
Martin

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Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von HSIUTZU CHANG
Gesendet: Mittwoch, 29. Juli 2009 16:03
An: statalist@hsphsun2.harvard.edu
Betreff: st: calculate the average by subgroup for a panel dataset

---------- Forwarded message ----------
From: HSIUTZU CHANG <hschangbetty@gmail.com>
Date: Wed, Jul 29, 2009 at 2:48 PM
Subject: calculate the average by subgroup for a panel dataset
To: statalist@hsphsun2.harvard.edu

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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