Precision and recall

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Precision or Positive Predictive Value is a measure for exactness and Recall or Sensitivity is a measure of completeness. They range from 0 to 1 and the best possible value for both of them is 1.

Precision = TruePositive / (TruePositive + FalsePositive)

Recall = TruePositive / (TruePositive + FalseNegative)


Wikipedia: Precision and recall

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