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st: Re: correlation for longitudinal data


From   José Maria Pacheco de Souza <jmpsouza@usp.br>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: correlation for longitudinal data
Date   Mon, 20 Jul 2009 11:06:07 -0300

<>
Dear people:
maybe extending the question of Ricardo -
I am running xtmixed for growth curves of z escores according ages 6-6 7-6 8-6 9-6 ... months and would like to get the correlation/covariance matrix of the observed and modeled z. Is it possible directly from the -long- data set?
Thanks for any help.
José Maria
Jose Maria Pacheco de Souza, Professor Titular (aposentado)
Departamento de Epidemiologia/Faculdade de Saude Publica, USP
Av. Dr. Arnaldo, 715
01246-904  -  S. Paulo/SP - Brasil
fones (11)3061-7747; (11)3768-8612;(11)3714-2403
www.fsp.usp.br/~jmpsouza
----- Original Message ----- From: "Ricardo Ovaldia" <ovaldia@yahoo.com>
To: <statalist@hsphsun2.harvard.edu>
Sent: Monday, July 20, 2009 10:51 AM
Subject: st: correlation for longitudinal data



Dear all,

Is there a way to estimate a correlation coefficient of two continuous measurements each collected over time on a sample of patients? Not sure if I can do this with -xtreg- for example.

Thank you,
Ricardo


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