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simply by conjoining the tests along the path to form the antecedent part
and taking the leaf's class prediction as the class value. For example, one of
the paths in Figure 1.6 can be transformed into the rule: “If customer age
is less than or equal to 30, and the gender of the customer is male — then
the customer will respond to the mail”. The resulting rule set can then be
simplified to improve its comprehensibility to a human user, and possibly
its accuracy [ Quinlan (1987) ] .
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