Hello again everyone - Using the 'Compare Goups 1scan/subject' analysis within the PET statistics, how can I increase the amount of groups to more than two??? Or is that even possible? short and simple i hope... thanks... Keith ---------------------------------------------------------------------- Keith Harenski B.S. Neurobiology of Psychosis WPIC - Rm# 986 p - (412)624-4943 f - (412)624-1459