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  • when we are building a decisiontree, we are usually calculating the gini impurity at each node.
  • I am interested to see the range of gini impurity in case of more than 2 classes.
  • Because entropy always have range=[0,1], irrespective of number of classes.

I have seen everywhere gin impurity have range=[0, 0.5]. But it is not true in the case of more than 2-classes.

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vimuth
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Ahmad Dawood
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1 Answers1

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  • The range of Gini impurity can be calculated by this formula: [0, 1-(1/n)] ,where n is the number of classes.
Ahmad Dawood
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