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HI - yes this looks correct. Yes, each set of IQ values should be demeaned before padding with zeros. Cheers. On 21 May 2013, at 00:18, Naama Barnea-Goraly <[log in to unmask]> wrote: > Dear FSL list experts, > > This is a question about a TBSS/randomise analysis. > > I ran correlation between scalars (e.g FA) and FSIQ in two groups: a clinical group and controls. The clinical group has a significant correlation between FA and IQ whereas the control group does not. > > I would like to check and see if these correlations are significantly different between groups (obviously the groups are much larger than this example). > > Would this model answer this question?: > > EV1 EV2 EV3 EV4 > 1 0 IQ 0 > 1 0 IQ 0 > 0 1 0 IQ > 0 1 0 IQ > > contrast: 0, 0 -1 1 and 0,0, 1,-1 > > Also - should the IQs be demeaned? > > Thank you, > > Naama > --------------------------------------------------------------------------- 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 --------------------------------------------------------------------------- Stop the cultural destruction of Tibet