I will be measuring several points in the XY plane and I will be calculating the mean of these points. For each point, there will be six trials. The six trials are necessary to accomplish the goal of determining accuracy in the measurements. What I want to do is determine how far each point is from the mean and also how far each point is from each other. I would like to write a command file in SYSTAT to make this work and end up with six Euclidean distance deviations (for six trials per point). The points should not deviate by more than 1% from the mean. This is a quality control measure. Any suggestions would be helpful. Thanks, David A. Brinkman, Research Associate University of Cincinnati ================================================================= Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =================================================================