Is there an efficient way to create a series of dummy codes from a single
variable? For example, I have a variable, “grade” = {2, …, 12}. I want to create
k-1 dummy codes for grade such that grade 2 is the base (i.e, grade 2 =0).
I am hoping that the new variables can be labeled as grade.3, grade.4 etc.
I'll then use
grade <- paste("grade.", 3:12, sep="") in as.formula to
build the model.
Thanks,
Harold
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