Dear Group, All the TBSS statistics examples we find assume 2 distinct groups that are being compared to each other….but we have a slightly different situation: We have a single group that varies along a behavioral measure. Can we use TBSS to correlate the behavioral measure to the tract skeletons? Thankyou very much, Dianne Patterson -- Dianne Patterson, Ph.D. Research Scientist [log in to unmask] <[log in to unmask]> University of Arizona Speech and Hearing Science 314 1131 E 2nd Street, Building #71 (Just East of Harvill) 621-9877 ============== If you write me (expecting an answer) and I don't respond within a day, then the email may have been lost. You can always write me at [log in to unmask] ==============