[R] Coding of categorical variables for logistic regression?
ravi.kulk at gmail.com
Sun Mar 28 19:15:52 CEST 2010
I am trying to do a logistic regression and have one predictor variable
(x) that is ratio and two predictor variables (y and z) that are
categorical. These have three levels each which I have called "High",
"Medium" and "Low".
My question: do I need to use a numerical coding scheme for the
categorical variables as required by some statistical software packages,
with some sort of numeric dummy-variable coding?
I am using:
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