Definition
Recall measures the coverage of the relevant documents of an information retrieval (IR) system. It is the fraction of all relevant documents that are retrieved. Consider a test document collection and an information need Q. Let R be the set of documents in the collection that are relevant to Q. Assume an IR system processes the information need Q and retrieves a document set A. Let |R| and |A| be the numbers of documents in R and A, respectively. Let |R ∩ A| denote the number of documents that are in both R and A. The recall of the IR system for Q is defined as R = |R ∩ A|∕|R|.
Key Points
Precision and recall are the most frequently used and basic retrieval performance measures. Many other standard performance metrics are based on the two concepts.
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© 2016 Springer Science+Business Media New York
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Zhang, E., Zhang, Y. (2016). Recall. In: Liu, L., Özsu, M. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4899-7993-3_479-2
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DOI: https://doi.org/10.1007/978-1-4899-7993-3_479-2
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Publisher Name: Springer, New York, NY
Online ISBN: 978-1-4899-7993-3
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