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Data comes from a study of Malignant Melanoma involving 400 subjects.
data(melanoma)
A data frame with 12 observations on the following 3 variables.
count
number of cases
tumor
type of tumor - a factor with levels freckle indeterminate nodular superficial
freckle
indeterminate
nodular
superficial
site
location of tumor on the body - a factor with levels extremity head trunk
extremity
head
trunk