figure 6 illustrates the effect of a threshold split applied to the incomevariable for a loan data set: It is clear that using such simple threshold splits (parallel tothe feature axes) severely limits the type ofclassification boundaries that can be induced.If one enlarges the model space to allow moregeneral expressions (such as multivariate hyperplanes at arbitrary angles), then the modelis more powerful for prediction but can bemuch more difficult to comprehend. A largenumber of decision tree and rule-inductionalgorithms are described in the machinelearning and applied statistics literature(Quinlan 1992; Breiman et al. 1984).To a large extent, they depend on lik
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