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Incorporating Continuous-Valued Attributes

  • ID3 is restricted to attributes with discrete values.
  • Continuous-valued attributes - example:
  • C4.5 allows continuous-valued attributes in the decision nodes inside the tree.
  • Approach: Dynamic definition of new discrete-valued attributes that partition the continuous attribute value into a discrete set of intervals (e.g. Ac is true if A < c, false otherwise).

  • Central question: How to select the best value for a threshold c?


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