yes!
andreas
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Von: FSL - FMRIB's Software Library [[log in to unmask]] im Auftrag von Mark Shen [[log in to unmask]]
Gesendet: Mittwoch, 12. Mai 2010 10:56
An: [log in to unmask]
Betreff: Re: [FSL] excluding subjects from TBSS Randomise
Thank you Stephen. Say I had 10 subjects, 3 groups of 3 subjects each, and I wanted to compare the FA between these 3 groups, while excluding the 10th subject from the analysis. Is this the correct .con and .mat file?
*matrix file
/NumWaves 4
/NumPoints 10
/PPheights 1 1
/Matrix
1 0 0 0
1 0 0 0
1 0 0 0
0 1 0 0
0 1 0 0
0 1 0 0
0 0 1 0
0 0 1 0
0 0 1 0
0 0 0 1
*contrast file
/NumWaves 4
/NumContrasts 6
/PPheights 1 1
/Matrix
1 -1 0 0
-1 1 0 0
1 0 -1 0
-1 0 1 0
0 1 -1 0
0 -1 1 0
Thank you in advance!
Mark
On May 5, 2010, at 6:43 AM, Stephen Smith wrote:
Hi - no, you need a new extra EV for each subject you want to exclude, with all zeros except for 1 corresponding to that subject.
Cheers
On 4 May 2010, at 18:49, Mark Shen wrote:
Hi FSL experts,
I conducted an unpaired group t-test on TBSS data, but now I want to exclude subjects from the statistical analysis without having to delete the subject's volume from all_FA. Can I just place zeros (0) for both contrasts for the corresponding subject I want to remove, so it is not considered when running the t-test? For example, if I had 5 subjects in each group, but now I wanted to exclude the 5th subject in the Group 1:
*contrast file:
/NumWaves 2
/NumContrasts 2
/PPheights 1 1
/Matrix
1 -1
-1 1
*matrix file
/NumWaves 2
/NumPoints 10
/PPheights 1 1
/Matrix
1 0
1 0
1 0
1 0
0 0
0 1
0 1
0 1
0 1
0 1
Thank you!
-Mark Shen
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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]<mailto:[log in to unmask]> http://www.fmrib.ox.ac.uk/~steve
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