is.categorical(c(1,2,3))
is.categorical(c(rep(1,20), rep(2, 20), rep(3, 20)), threshold=5)
is.categorical(c("A","B","B"))
is.categorical(factor(c("A","B","C")))
is.categorical(factor(c("A","B","B","A")))
is.categorical(factor(c(TRUE, FALSE, TRUE, FALSE)))
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