Just ideas I had about how to set the contrast for ANOVA, but not sure if any of them is valid.
Gabriel

 





> Date: Fri, 18 Mar 2011 13:57:31 -0400
> From: greve@nmr.mgh.harvard.edu
> To: gabriellbk@hotmail.com
> CC: freesurfer@nmr.mgh.harvard.edu
> Subject: Re: [Freesurfer] 2x2x2 design
>
> Gabriel, what are options 1 and 2 supposed to represent?
> doug
>
> Gabriel Go.Es. wrote:
> >
> > Dear Freesurfer experts,
> > I'm wondering how to set a 2x2x2 anova
> >
> > (diagnosis)x(gender)x(apoe)
> >
> > g1MaleE4
> > g1MalenoE4
> > g1FemaleE4
> > g1FemalenoE4
> > g2MaleE4
> > g2MalenoE4
> > g2FemaleE4
> > g2FemalenoE4
> >
> > option 1
> > [1 1 -1 -1 0 0 0 0]
> > [1 1 0 0 -1 -1 0 0]
> > [1 1 0 0 0 0 -1 -1] /2
> >
> > option 2
> > [1 1 1 1 -1 -1 -1 -1]
> > [1 1 -1 -1 1 1 -1 -1]
> > [1 -1 1 -1 1 -1 1
> > -1] /4
> >
> >
> > And really have no idea about the interections between factors. Could
> > you tell me for example how to evaluate the diagnosis x gender
> > interaction effect and the interaction among the three factors
> > (diagnosis x gender x apoe).
> >
> > Bests regards,
> > Gabriel
> > ------------------------------------------------------------------------
> >
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>
> --
> Douglas N. Greve, Ph.D.
> MGH-NMR Center
> greve@nmr.mgh.harvard.edu
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>
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