Hi,
exactly in the same way: specify in the "General Linear Model" window that you have 4+3=7 evs in your design matrix, with the first 4 columns being your 4 groups, the next three your 3 covariates...
Cheers,
Gwenaelle
--- En date de : Ven 26.2.10, Andres Roman Urrestarazu <[log in to unmask]> a écrit :
> De: Andres Roman Urrestarazu <[log in to unmask]>
> Objet: Re: [FSL] design matrix
> À: [log in to unmask]
> Date: Vendredi 26 février 2010, 16h02
>
>
>
>
>
> RE: [FSL]design matrix
>
>
>
>
>
>
> Hi Gwenaelle,
>
>
>
> Thank you very much for your help. I still have some
> questions regarding the design matrix for fslvbm. Since as
> you know I have four groups how can I add 3 different
> covariates to my design matrix?
>
>
>
> Thank you again.
>
>
>
>
>
> Andres Roman Urrestarazu MD, MSc IHP, BM
>
>
>
> University of Cambridge
>
> Department of Psychiatry
>
> Addenbrookes Hospital
>
> Box 189
>
> Cambridge
>
> CB2 0QQ
>
> UK
>
> Telephone: 0044 01223 764421
>
> Mobile: 0044 07 775614709
>
>
>
>
>
>
>
> -----Original Message-----
>
> From: FSL - FMRIB's Software Library on behalf of
> Gwenaëlle DOUAUD
>
> Sent: Tue 2/23/2010 5:22 PM
>
> To: [log in to unmask]
>
> Subject: Re: [FSL] fslvbm problems header
>
>
>
> 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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>
