Decision rules

A set of decision rules is the verbal equivalent of a graphical decision tree, which specifies class membership based on a hierarchical sequence of (contingent) decisions. Each rule in a set of decision rules therefore generally takes the form of a Horn clause wherein class membership is implied by a conjunction of contingent observations.


 * IF $$condition_1$$ AND $$condition_2$$ AND ... AND $$condition_n$$ THEN CLASS = $$class_i$$

where $$condition_j$$ is in general contingent on the choice of $$condition_{j-1}$$. Decision rules can be transcribed from the corresponding decision tree, or can be induced directly from observations.