Encyclopedia of Database Systems

Living Edition
| Editors: Ling Liu, M. Tamer Özsu

Average Precision

  • Ethan Zhang
  • Yi Zhang
Living reference work entry
DOI: https://doi.org/10.1007/978-1-4899-7993-3_482-2

Definition

Average precision is a measure that combines recall and precision for ranked retrieval results. For one information need, the average precision is the mean of the precision scores after each relevant document is retrieved.
$$ \mathrm{Average}\ \mathrm{Precision}=\frac{{\displaystyle {\sum}_rP}@r}{R} $$
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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.University of CaliforniaSanta CruzUSA
  2. 2.Yahoo! Inc.Santa ClaraUSA