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data(Cancer)
rll{ No Name Levels 1 Survival "Died", "Surv" 2 Grade "Malignant", "Benign" 3 Center "Boston", "Glamorgan" }
Survival
"Died", "Surv"
Grade
"Malignant", "Benign"
Center
"Boston", "Glamorgan"
Whittaker, J. (1990) Graphical Models in Applied Multivariate Statistics New York: John Wiley and Sons, p. 220.
data(Cancer) # example goes here
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