Hi,
Can you let me know which version of fsl you are using and the
contents of your design.con and design.mat files?
Many Regards
Matthew
> Hello list,
>
> I've just run a multiple regression with tbss on some skeletonised
> FA data in a single group of subjects using 3 EVs - age, 1 target
> behavioural variable and 1 potentially confounding behavioural
> measure. I created a design matrix with the 3 normalised EVs, and
> orthogonalised the target EV with respect to age and the confounding
> EV. I assumed this would show me the changes in FA attributable to
> the target EV with the other 2 covaried out. This was using
> randomise and the TFCE option. When I display the
> tbss_tfce_corrp_tstat contrast image in fslview with the -b 0.95,1
> threshold, most of the skeletonised data appears to correlate with
> the target variable. This is the case even when I use a more
> conservative 0.99,1 threshold.
>
> I found this a little surprising, so ran the same design again
> without orthogonalising the target EV. The results were virtually
> the same.
>
> So I guess the question is, have I done anything wrong here?
>
> thanks in advance,
>
> Greig
>
>
>
> --
> Dr Greig de Zubicaray | fMRI Laboratory
> Centre for Magnetic Resonance | University of Queensland |
> Brisbane, QLD 4072 | AUSTRALIA
> Phone: +61-7-3365-4250 (direct) | +61-7-3365-4100
> (reception) | Fax: +61-7-3365-3833
> Email: [log in to unmask] | Web: http://www.fmrilab.net/
> CRICOS Provider Number 00025B
>
