Definition
Recall measures ?> the ability of a search engine or retrieval system to locate relevant material in its index. Precision measures its ability to not rank nonrelevant material. With everything above rank cut-off n considered “retrieved” and everything below considered “not retrieved,” precision and recall can be stated mathematically as:
Key Points
Precision and recall are the traditional metrics for retrieval system performance evaluation, and nearly all other performance measures can be seen as either precision-based, recall-based, or a combination of the two.
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Recommended Reading
van Rijsbergen CJ. Information retrieval. London: Butterworths; 1979.
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Carterette, B. (2016). Precision and 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_5050-2
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DOI: https://doi.org/10.1007/978-1-4899-7993-3_5050-2
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Publisher Name: Springer, New York, NY
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