I have two regressions to perform - one with a metric DV (-3 to 3), the other with an ordered DV (0,1,2,3). Neither normal distribution nor homoscedasticity is given. I have a two questions:
Some sources say robust regression take care of both lack of normal distribution and heteroscedasticity, while others say only of normal distribution. What is true?
Are there ways of using robust regressions with ordered data, or is that only possible for metric DVs?
I have SPSS, R, and MPLUS available.