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Number of smokers in a case-control study.
data(Smoking_Wassink1945)
The format is: table [1:4, 1:2] 6 18 36 74 19 36 25 20 - attr(*, "dimnames")=List of 2 ..$ Smoking : chr [1:4] "Nonsmoker" "Moderate smoker" "Heavy smoker" "Very heavy smoker" ..$ Diagnosis: chr [1:2] "Lung cancer" "Healthy control"
Richard Doll (1998), Uncovering the effects of smoking: historical perspective. Statistical Methods in Medical Research, 7(87), 87-117