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.
** Attribute information**
a.Age of patient at time of operation (numerical)
b.Patient's year of operation (year - 1900, numerical)
c.Number of positive axillary nodes detected (numerical)
d.Survival status (class attribute):
1 = the patient survived 5 years or longer
2 = the patient died within 5 year