The same predictor variable may appear in different paths in a decision tree and even more than once in the same path.

Name: The same predictor variable may appear in different paths in a decision tree and even more than once in the same path.
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Question

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For example, tree rules may say "If above $1 million, then outcome A. If below $1 million, then if below $250,000 then outcome B, else outcome C." This is true of both classification and regression trees.

The Same Predictor Variable May Appear in Different Paths in a Decision