Any assistance would be appreciated: I am attempting to run some survival analyses using Stata STCOX, and am getting messages that certain variables are collinear and have been dropped. Unfortunately, these variables are the ones I am testing in my analysis! I would appreciate any information or recommendations on how best to diagnose and explore solutions to this problem. Thanks! Elan ================================================================= Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =================================================================