 |
 |
Thanks!! :) G On Wed, Sep 1, 2010 at 9:25 AM, Stephen Smith <[log in to unmask]> wrote: > Hi - yes, that's all correct. And if you want to test for *interactions* > between group and L-R you can use [1 -1] (etc.) contrasts. > Cheers. > > > On 1 Sep 2010, at 13:43, Gigi Luk wrote: > > Hi, > > I posted the following message last week but haven't received a > response.... Just want to repost it here... Any help/suggestion/comment is > appreciated. > > Thanks! > G > > ------------------------------------------------------------------------------------------------------------------------------------------------------- > I've run a left-right asymmetry comparison in tbss between 2 groups of > subjects. I set up the contrasts according to a previous thread on this > topic. Here is my design.con for this asymmetry analysis on FA values: > > /NumWaves 2 > /NumContrasts 4 > /PPheights 1 1 > /Matrix > 1 0 > -1 0 > 0 1 > 0 -1 > > My understanding is that the first contrast compares L>R and second > contrast compares R>L for group1 (and the same for the last 2 contrasts > concerning group2). In the corrected p-value files, all the significant > results are on the left hemisphere. I am assuming this is because the > analysis was performed on left-minus-right skeletons. Is this correct?? Can > anyone confirm? > > > > --------------------------------------------------------------------------- > 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<http://www.fmrib.ox.ac.uk/%7Esteve> > --------------------------------------------------------------------------- > > > >