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st: re: GEE with multiple within subject factors


From   Kit Baum <[email protected]>
To   [email protected]
Subject   st: re: GEE with multiple within subject factors
Date   Sat, 31 Jan 2009 09:59:14 -0500

<>
Peter wrote

I have a data set with subject, legs (within subject), time (3 occasions
over which measurements are taken on each leg) and 2 readings
(measurements per leg).

To specify a unique record I need  to specify subject, leg, time and
reading. How do I do this in Stata 8.2?  I"ve been playing around with
'iis' and 'tsset' to no avail. I keep getting 'time duplicated within a
panel' error message'
(I can get this to run in SPSS 15     within factors are leg, time and
reading but I'd like to try Stata.)


egen rec = group(subject leg reading)
xtset rec time

I don't see why 'within factors' would include time but not subject. Aren't the repeated measurements taken over different times?

Kit Baum, Boston College Economics and DIW Berlin
http://ideas.repec.org/e/pba1.html
An Introduction to Modern Econometrics Using Stata:
http://www.stata-press.com/books/imeus.html


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