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clarfication
2011 Feb 10
0
Question about the covariate Z in rhierMnlRwMixture (bayesm)
Hello!
I am using rhierMnlRwMixture from bayesm package. I would like to use
it with a categorical covariate (Z).
I have 2 clariciation questions:
1. If the covariate is categorical, do I have to represent it as dummy
variable(s)? (e.g., 2 dummy variables for a 3-level categorical
variable)?
2. Do those dummy variables have to be centered? Help file for
rhierMnlRwMixture says: "Z should not include an intercept and is
centere...