That contrast is wrong. I've updated this page with the correct contrast https://surfer.nmr.mgh.harvard.edu/fswiki/Fsgdf6G0V which is:
|+1 -1 0 -1 +1 0| |+1 0 -1 -1 0 +1| This is an F-contrast (two rows). The first row looks for a difference between L and R for M and F (ie, a simple interaction between LR and MF). The second row looks for a difference between L and A for M and F. If either of these subcontrasts shows an effect, then there is an interaction. doug Gabriel Go.Es. wrote: > > Dear FreeSurfer experts, > > > > I'm doing some group analyses and I'm a little stocked with this: > > I have Six Groups (2 Factors, one with three levels and the other one > with two levels), and one covariate. I don't know the rule for setting > the contrasts for an ANOVA and for the interaction between the two > factors regressing out the covariate. I've checked at the FS wiki and > found the following contrast for six groups (two factors) and zero > covariates. > > > > Contrast 6 gender-x-handedness.mtx (interaction between gender and > handedness) > > [0.333 -0.333 -0.333 0.333 0.000 0.000 0.000 0.000 0.000] > > [0.000 0.000 0.000 0.000 0.000 0.333 -0.333 -0.333 0.333] > > > > I don’t understand the rule that has been followed. > > Can any one help me with this? > > > > Bests, > > Gabriel > > > > > > > ------------------------------------------------------------------------ > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer -- Douglas N. Greve, Ph.D. MGH-NMR Center gr...@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
