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Generating good decision rules

Ian Witten explains how both PART and Ripper can make good rules. Ripper uses incremental error pruning followed by a complex optimization step.

Here are a couple of schemes for rule learning. The first, called PART, is a way of forming rules from partial decision trees. The second, called Ripper (JRip in Weka), uses incremental reduced-error pruning, followed by a fiendishly complicated global optimization step that’s detailed, complex, unprincipled, but works well and often generates unbelievably small rule sets that do an excellent job. I’ll spare you the details – you really don’t want to know! Both methods are easy to use in Weka.

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