Encyclopedia of Database Systems

2018 Edition
| Editors: Ling Liu, M. Tamer Özsu


  • Steven M. BeitzelEmail author
  • Eric C. JensenEmail author
  • Ophir FriederEmail author
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_493


Geometric mean average precision


The Geometric Mean Average Precision (GMAP) is the geometric mean of the average precision values for an information retrieval system over a set of n query topics. GMAP is expressed as follows (from [ 1]):
$$ \mathrm{GMAP}=\sqrt[n]{{\displaystyle \prod_n{\mathrm{AP}}_n}} $$
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Recommended Reading

  1. 1.
    National Institute of Standards and Technology. TREC-2004 common evaluation measures.Google Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Telcordia TechnologiesPiscatawayUSA
  2. 2.Twitter, Inc.San FranciscoUSA
  3. 3.Georgetown UniversityWashingtonUSA

Section editors and affiliations

  • Weiyi Meng
    • 1
  1. 1.Dept. of Computer ScienceState University of New York at BinghamtonBinghamtonUSA