Hi,
You need to supply two additional inputs to randomise: A 4D
volume file, where each voxel timeseries corresponds to equivalent
voxel-dependent EV and a number telling randomise which column in your
original input design the voxelwise EV replaces:
e.g --vxl=2 --vxf=my_input_EV
tells randomise for each voxel to replace the 2nd EV in your input
design with the appropriate "timeseries" from my_input_EV.
Many Regards
Matthew
> Thank for your answer but I'm not sure how to do it. When you use
> randomise, you feed it with your 4D image, the design.mat file and the
> design.con file but none of them contain information about the
> voxel-dependent EV except one column including mean across all voxels.
> How can I specify my voxel-dependent EV in the randomise model?
>
> Thanks,
>
> Herve
>
>
> -----Original Message-----
> From: Steve Smith [mailto:[log in to unmask]]
> Sent: Wednesday, March 25, 2009 9:00 AM
> To: [log in to unmask]
> Subject: Re: [FSL] randomise and voxel-dependent EVs
>
> Hi,
>
> See the usage - you should just be able to specify this additional
> component to your model.
>
> Cheers.
>
>
>
> On 24 Mar 2009, at 14:42, Herve Lemaitre wrote:
>
>> Hi FSL experts,
>>
>> In a TBSS analysis, I would like to use randomise with a statistical
>> design including one voxel-dependent EV. Is it implemented in
>> randomise and do I have to change the way to run randomise to take
>> into account this EV?
>>
>> Thanks,
>>
>> Herve Lemaitre
>>
>>
>>
>
>
> ------------------------------------------------------------------------
> ---
> 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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