Hi Ryan, it will depend on the order of the classes in your FSGD file and the order of the +1s and -1s in your contrast. Can you send your FSGD file? If you want to do a post-hoc analysis to see where your interaction is coming from, you can look at csdbase.y.ocn.dat (output from the simulation). From mri_glmfit-sim --help:
csdbase.y.ocn.dat - this is a summary of the input (y) over each cluster. It has a column for each cluster. Each row is a subject. The value is the average of the input (y) in each cluster. This is a simple text file. You should be able to see which group is thinning and which is thickening. doug On 10/24/2012 12:54 AM, Ryan wrote: > Hello everyone, > I'm conducting an analysis involving a training group and a control > group, where each group has a pre and a post scan. I setup the matrix > file, the contrast file, and ran mri_glmfit along with mri_glmfit-sim > for the cluster correction. The analysis finished revealing a > significant cluster, although I want to confirm that my interpretation > of the results is correct. I see a significant cluster which I believe > means the training group showed greater thickening compared to the > controls, is this correct? Also, how can I tell if clusters represent > thickening or thinning in the training group compared to the control > group? > > When I setup the matrix file, I entered 1's and -1's for the control > subjects in the first column, and training subjects in the second > column. When I setup the contrast file, I entered a -1 and then a 1, > with 0's for the rest of the variables. > > Thanks for the help. > -W. Ryan McGarry > > > _______________________________________________ > 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.
