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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 > --------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------