The data set concerns some risk factors for developing a certain type of heart disease. It consists of 6 variables measured on 1841 people. It has the following variables:
a: Smoking (No, Yes)b: Strenuous mental work (No, Yes)c: Strenuous physical work (No, Yes)d: Systolic blood pressure (<140, >140)e: Ratio of alpha/beta lipoproteins (<3, >3)f: Family anamnesis of heart disease (Negative, Positive)