Re: [Freesurfer] Contrast of three groups

Hi Doug,

Thanks for the answer. How can I examine differences between the groups?

Best Heidi

________________________________________ Van: freesurfer-bounces@nmr.mgh.harvard.edu [freesurfer-bounces@nmr.mgh.harvard.edu] namens Douglas N Greve [greve@nmr.mgh.harvard.edu] Verzonden: woensdag 29 mei 2013 17:30 Aan: freesurfer@nmr.mgh.harvard.edu Onderwerp: Re: [Freesurfer] Contrast of three groups

Hi Heidi, That will test the effect of the continuous variable averaged over the 3 groups. doug

On 05/29/2013 10:40 AM, Jacobs H (NP) wrote:

Hi FreeSurfers,

I have a more statistical question:

I have three groups of subjects and I want to examine the effect of a continuous variable (cognition). Is it possible to examine three groups? Or should I do pairwise comparisons? What would the contrast than look like? Something like this:

0 0 0 0 0 0 0.33 0.33 0.33

(first three zeros for the three groups; three zeros for age-correction; three weights for cognition scores)??

Thanks!

Heidi

================================================ Dr. Heidi Jacobs Postdoc researcher Faculty of Health, Medicine and Life Sciences School for Mental Health and Neurosciences Division Cognitive Neuropsychiatry and Clinical Neurosciences Alzheimer Center Limburg h.jacobs@maastrichtuniversity.nl www.maastrichtuniversity.nl www.heidijacobs.nl

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