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RE: st: linear mixed models doubt in how to interpret the Coef


From   "Michael Ghebre" <m.a.ghebre@qmul.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: linear mixed models doubt in how to interpret the Coef
Date   Thu, 30 Jun 2011 16:31:06 +0100

Luisa,

Include time and glu_std interaction (glu_std*time) in your model and that
will tell you how that association carried out over time. 

Hope this helps 

Michael 

Michael A Ghebre
Research Fellow in Medical Statistics
Centre for Environmental and Preventive Medicine 
Wolfson Institute of Preventive Medicine 
Barts and the London School of Medicine and Dentistry 
Queen Mary University of London 
Charterhouse Square London EC1M 6BQ
Email : m.a.ghebre@qmul.ac.uk 
Tel : 02078826267
http://www.wolfson.qmul.ac.uk



-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Luisa
Soares-Miranda
Sent: 30 June 2011 16:09
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: linear mixed models doubt in how to interpret the Coef

Dear Maarten,

Thank you for your help. But even though can I say that a longitudinal
analyze of the associations between Glu and SDNN was cerried out?

thanks

Luisa

On Thu, Jun 30, 2011 at 3:57 PM, Luisa Soares-Miranda
<luisasoaresmiranda@gmail.com> wrote:
> Dear all,
>  I am writing you because I am performing a longitudinal mix models
> analyses as the following
>
> xi: xtmixed sdnn i.year_of_visit  gender  age  smoke alcohol
> waistcinrcunfrence_std  pa_std  tasis_std   trg_std  glu_std hdl_std
> || id: i.year, covariance(identity)
>
> I have 3 years of data, my main doubt now is how can I interpret my
> Coefficient? If my results I have that the Coef of Glu is  -3.35 and
> the p is 0.001. Can I say that when I increase by one unit Glu sdnn
> decreases -3.35 ms over 3 years? So Glu is associated with a decrease
> in sdnn over time.
> thank you so much for your help,
> regards
> Luisa
>
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