Basic Performance Measures for Information Retrieval

Precision and recall and their combinations are the most common measures for evaluating the performance of information retrieval systems. These measures require a collection of documents, a query, and a set of relevance judgments.
Mark a retrieved item as relevant or irrelevant by clicking it and watch how measures change. Relevant items are denoted by a light purple background when clicked. Mouseover the measures to see their definitions.

THINGS TO TRY

SNAPSHOTS

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DETAILS

Reference:
"Information Retrieval" on Wikipedia.
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