What is the entropy of this collection of training examples with respect to the positive class?
What is the entropy of this collection of training examples with respect
to the positive class?
There are four positive examples and five negative examples. Thus,
P(+) = 4/9 and P(?)=5/9. The entropy of the training examples is
?4/9 log2(4/9) ? 5/9 log2(5/9) = 0.9911.
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