Hi, the easiest thing to do is to separate the all_FA_skeletonised 4D
image to give a 4D image containing just the patients. You can for
example do this with avwroi if the patients are in a contiguous group
within the file, or avwsplit otherwise. You can then recombine with
avwmerge.
You should then form a model with just the clinical scores in it,
demeaned, and use the -D option in randomise to also demean the data.
Cheers, Steve.
On 1 Mar 2007, at 17:48, Riccardo Della Nave wrote:
> Dear fsl experts,
> I have interisting results in a patients vs controls study
> conducted by TBSS
> and randomise using a two sample t-test design as described in the
> TBSS web
> page.
> Next step is to correlate some clinical scores in the patients
> groups in
> order to see if FA in any tract is related to disability or illness
> duration. This kind of analysis is described in the TBSS article on
> Neuroimage (MS and EDSS, ALS and Disease duration) but cause I'm a
> beginner
> with fsl inference I really need a detailed "practical guide" to
> bring these
> analysis.
> Thanks
>
> Riccardo
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Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
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