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


From   Luisa Soares-Miranda <luisasoaresmiranda@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: linear mixed models doubt in how to interpret the Coef
Date   Thu, 30 Jun 2011 17:15:32 +0100

Dear Michael ,

Thank you so ouch for your help , I have tried to include in the
command the interaction glu_std * time but a error is reported. I
literally have to include in the command glu_std*? And with that I can
say that my coefficient is higher or lower over time?
regards

Luisa


On Thu, Jun 30, 2011 at 4:31 PM, Michael Ghebre <m.a.ghebre@qmul.ac.uk> wrote:
> 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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