Hello all, Is it possible to compute a statistical power for a TBSS analysis? Do you need to do this on a voxel-wise basis by getting the means/standard deviations of the DTI variables of each voxel? Can you use the standard power calculations for the t-test with unknown effect size? Thanks in advance, Chris Adamson. Dr Christopher Adamson, PhD (Melb.), B Software Engineering (Hons., Monash) Research Officer Developmental and Functional Brain Imaging, Critical Care and Neurosciences Murdoch Childrens Research Institute The Royal Children's Hospital Flemington Road Parkville Victoria 3052 Australia T 9345 4306 M XXXX XXX XXX E [log in to unmask] www.mcri.edu.au ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com ______________________________________________________________________