Hi Steve,
with your help and a lucky meeting with Antonio in Siena I think I have
understood how to arrange correlation analysis by randomise and tbss.
thanks
Riccardo
On Fri, 2 Mar 2007 06:37:50 +0000, Steve Smith <[log in to unmask]>
wrote:
>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
>
>
>------------------------------------------------------------------------
>---
>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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