Hi Andres,
using the Glm gui, you simply need to specify in the "General Linear Model" window that you have 4 evs in your design matrix (after switching from timeseries design to higher-level/non timeseries design in the "GLM setup" window).
Cheers,
Gwenaelle
> Hi,
>
>
>
> Im working on a big data sample (n=222) doing VBM for
> subjects at high risk of psychosis. I have come across some
> issues with the design.mat since I have 4 different groups
> (Psychosis, clinical high risk, genetic risk and controls)
> comparing grey matter density between them. The Glm options
> and FEAT usually involve a two group comparison so I was
> wondering if any of you had any experience in multiple group
> comparisons while creating the design matrix. Thank you very
> much for your help.
>
>
>
> best wishes
>
>
>
> Andres Roman Urrestarazu MD, MSc IHP, BM
>
>
>
> University of Cambridge
>
> Department of Psychiatry
>
> Addenbrookes Hospital
>
> Box 189
>
> Cambridge
>
> CB2 0QQ
>
> UK
>
>
>
>
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