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Converts a factor (categorical) variable to a matrix of dummy codes using a 1 of C-1 binary coding scheme.
dummy.code(x)
a matrix with the number of rows equal to the number of cases in x
x
and the number of columns equal to one minus the number of factors in
x. The last factor serves as the reference group.
a factor variable.
print(dummy.code(iris$Species))
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