Dear Andreas,
spm_orth performs serial orthogonalization of regressor j w.r.t. regressor j - 1. This means that D will be orthogonalized w.r.t. C
Best
Martin
On 12/03/2014, at 16.28, "Andreas Hahn" <[log in to unmask]> wrote:
> Dear SPM-experts,
>
> We have a design with 5 regressors (A-E), where 2 might be correlated (C & D) and which we would like to orthogonalize:
> A B C D E
> Is there a way to only orthogonalize D to C but leave the remaining regressors unchanged (as opposed to spm_orth which does serial orthogonalization of all regressors, right?)?
>
> Thank you and best regards,
> Andreas
>
> --
> Andreas Hahn, MSc PhD
> Functional, Molecular & Translational Neuroimaging
> Department of Psychiatry and Psychotherapy
> Medical University of Vienna, Austria
> Phone: +43-1-40400-2320
> Email: [log in to unmask]
> Web: http://www.meduniwien.ac.at/neuroimaging/
>
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