Hello,
randomise should automatically switch to sign-flipping for the second design - you can confirm this by looking for "One-sample design detected; sign-flipping instead of permuting.” in the output.
Kind Regards
Matthew
--------------------------------
Dr Matthew Webster
FMRIB Centre
John Radcliffe Hospital
University of Oxford
> On 24 Aug 2018, at 10:15, LC <[log in to unmask]> wrote:
>
> Dear all,
>
> I have a very basic question about the functioning of Randomise. I was wondering if running the randomise function one sample t-test using
>
> randomise -i OneSamp4D -o OneSampT -1 -T
>
> With the data of one group in 'OneSamp4D'
>
> Gives the same result as running a ‘fake’ two-sample t-test
>
> randomise -i TwoSamp4D -o TwoSampT -d design.mat -t design.con -m mask -T
>
> With the data of both groups in ‘TwoSamp4D’
> design.con = [0 1]
> and design.mat e.g. [0 1; 0 1; 1 0; 0 1; 0 1; ...];
>
> In a (recently developed) toolbox I’m using they implemented the second way, but I wanted to make sure that Randomise performs sign flipping to calculate the clusters, as it would in the first way.
>
> Thanks a lot,
>
> Lars
>
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