Fig. 3.1 A decision tree derived from Table 3.1. The 860 persons are classified into “young” (died before the age of 70) and “old” (died at 70 or later). People who smoke generally die young (195 persons of which 11 are misclassified). People who do not smoke and do no drink tend to live
long (65 persons of which 2 are misclassified). People who only drink but are overweight (≥90)
also die young (381 persons of which 55 are misclassified)