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Generates a class indicator function from a given factor.
class.ind(cl)
a matrix which is zero except for the column corresponding to the class.
factor or vector of classes for cases.
Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.
set.seed(99) a <- rbinom(20, 4, 0.5) table(a) b <- class.ind(a) str(b) t(cbind(a, b))
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