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Re: st: correlation for longitudinal data


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: correlation for longitudinal data
Date   Wed, 22 Jul 2009 09:36:00 -0700 (PDT)

Thank you Joseph.
That is exacly what I needed.

Ricardo

Ricardo Ovaldia, MS
Statistician 
Oklahoma City, OK


--- On Wed, 7/22/09, Joseph Coveney <jcoveney@bigplanet.com> wrote:

> From: Joseph Coveney <jcoveney@bigplanet.com>
> Subject: Re: st: correlation for longitudinal data
> To: statalist@hsphsun2.harvard.edu
> Cc: ovaldia@yahoo.com
> Date: Wednesday, July 22, 2009, 11:31 AM
> 
> Ricardo Ovaldia wrote:
> 
> 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.
> 
> --------------------------------------------------------------------------------
> 
> I think that you're asking about a multivariate measurement
> over time, such as
> left eye intra-ocular pressure and right eye intra-ocular
> pressure during
> treatment for glaucoma; you want to estimate the
> correlation of intra-ocular
> pressure measurements between eyes over time in a group of
> patients.  Or
> something analogous, such as what's the correlation between
> physiological
> measurements made by a novel method and the conventional
> method in a group of
> patients undergoing a period of evaluation for some
> disease.
> 
> You can do that with -xtmixed-.  Take a look at the
> discussions and
> illustrations of various types of intraclass correlation
> coefficients in S.
> Rabe-Hesketh & A. Skrondal, _Multilevel and
> Longitudinal Modeling Using Stata_
> (College Sta., Texas: Stata Press, 2005 or 2008). 
> There are several places in
> the first edition (which is what I have) where the topic is
> covered, and I
> assume that the second edition does, too.
> 
> Joseph Coveney
> 
> 
> 
> 


      

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