The dataset contains cases from a study that was conducted between 1958 and 1970 at the University of Chicago's Billings Hospital on the survival of patients who had undergone surgery for breast cancer.
data(survival)A data frame with 306 rows and 3 variables:
Age of patient at time of operation (numerical)
Patient's year of operation (year - 1900, numerical)
Number of positive axillary nodes detected (numerical)
(class attribute) -- 1 = the patient survived 5 years or longer -- 2 = the patient died within 5 year