appologies, I think you are supposed to assign one of the groups as a "referent", namely, keep it as a continous variable,and dichotomize the rest.
if you referent the lowest group, and there is a positive trend, all other groups should have increasing coefficients.. it is hard to conceptualize and I couldn't find material on how to do it.. . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
