Hi, Just a hypothetical problem... Lets say I test participants in three "light" conditions (dim light, bright light, no light) to see how they reach an object. There are 20 trials within each condition. There are four possible reaching trajectories (A, B, C, and D). Lets define them by a particular angle of a reaching arm to the frontal plane of a participant. I expect that performance in any of the three "light" conditions will follow a trajectory "C", and not any other trajectory. That is, angles of a reaching arm should correspond to angle of trajectory "C" What would be the most suitable test of this prediction? How could I conduct such test in SPSS? Thanks for your help!