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Precision and Recall

Tool to compute statistical measures of Precision and Recall. Precision and recall are two statistical measures which can evaluate sets of items, also called predictive value and sensitivity.

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Precision and Recall -

Tag(s) : Data processing,Mathematics

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Precision and Recall

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Precision P and Recall R Calculator

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Tool to compute statistical measures of Precision and Recall. Precision and recall are two statistical measures which can evaluate sets of items, also called predictive value and sensitivity.

Answers to Questions

How to calculate Precision?

For a search, the precision is the ratio of the number of pertinent items found over the total number of items found.

$$ \text{Precision}=\frac{|\{\text{Relevant items}\}\cap\{\text{Retrieved items}\}|}{|\{\text{Retrieved items}\}|} $$

How to calculate Recall?

The recall is the ratio of the number of pertinent items found over the total number of relevant items.

$$ \text{Recall}=\frac{|\{\text{Relevant items}\}\cap\{\text{Retrieved items}\}|}{|\{\text{Retrieved items}\}|} $$

How to calculate F-measure (F1 score)?

F-measure (or F1 score) is the harmonic mean of precision and recall

$$ F = \frac{2 (\text{precision} \times \text{recall})}{(\text{precision} + \text{recall})} $$

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