Hi, I am doing a usability study. I have 3 variables for which I want to obtain a score. U1 = f( X1, X2, X3) I am 33 other variables for whcih I want to obtain a score. U2 = f(S1, S2,...., S33) Then my goal is to show that U1 = U2 Any ideas on the statistical methods that can be applied? I have 50 subjects (cases). -- Thanks, Jim. You may leave the list at any time by sending the command SIGNOFF allstat to [log in to unmask], leaving the subject line blank.