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Decision Trees and Rules

  • Rules can represent a decision tree:
      if item1 then subtree1
      elseif item2 then subtree2
  • There are as many rules as there are leaf nodes in the decision tree.
  • Advantage of rules over decision trees:
    • Rules are a widely-used and well-understood representation formalism for knowledge in expert systems;
    • Rules are easier to understand, modify and combine; and
    • Rules can significantly improve classification performance by eliminating unnecessary tests.
    • Rules make it possible to combine different decision trees for the same task.

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