Nothing
id <- c(1, 2, 3, 4, 5, 6)
age <- c(30, 32, 28, 39, 20, 25)
edu <- c(0, 0, 0, 0, 0, 0)
classNames <- c( "poor", "middle")
class <- rep( classNames, c(3, 3))
factor( class, levels= classNames)
indianMothers <- data.frame(id=id,
age,
edu,
class)
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