Hi - that's all fine. For these contrasts it shouldn't make any
difference whether you demean EVs 3 and 4, but for other contrasts you
probably should.
Cheers.
On 20 Apr 2008, at 16:43, Suzanna Laycock wrote:
> Hi all,
>
> Sorry to ask this question, but could someone please just correct
> this.
>
> I'm interested in correlating a behavioural score with FA using
> randomise.
>
> As an example, should I set up the design matrix like this:
>
> Group 1 Group 2 EV1 EV2
> 1 0 a 0
> 1 0 b 0
> 1 0 c 0
> 0 1 0 d
> 0 1 0 e
> 0 1 0 f
>
> Do I need to demean the behavioural scores?
>
> Secondly, how do I set up the contrasts?
>
> 0 0 -1 1
> 0 0 1 -1
>
> I would appreciate it if someone could just correct me.
>
> Thanks
> Suzanna
>
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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
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