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st: Covariates in ANOVAs


From   Miss Gina Micke <gina.micke@uqconnect.edu.au>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: Covariates in ANOVAs
Date   Fri, 15 May 2009 01:15:30 +0000

Hi List,

I would like to know how to control for an independent continuous variable when using a repeated measures ANOVA. I have a 2x2 factorial design experiment with males and females in each of the treatment groups (T1 & T2) measured at multiple "events", each subject assigned an "id". The subjects are all different ages so I would like to be able to control for the effect of "age range".

If I didn't have "age range" as a covariate my model would be as follows:

anova x T1 T2 sex T1*T2 T1*sex T2*sex T1*T2*sex/id|T1*event T2*event T1*T2*event sex*event sex*T1*event sex*T2*event T1*T2*sex*event, repeated(event) partial bse(id|T1*T2*sex)


Do I use the ANCOVA and cont(age range) command? Is this output the effects of my fixed factors taking into account the effect of age range?

Thanks.

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