Synonyms
Mean average precision
Definition
The Mean Average Precision (MAP) is the arithmetic mean of the average precision values for an information retrieval system over a set of n query topics. It can be expressed as follows:
where AP represents the Average Precision value for a given topic from the evaluation set of n topics.
Key Points
The Mean Average Precision evaluation metric has long been used as the de facto “gold standard” for information retrieval system evaluation at the NIST Text Retrieval Conference (TREC) [1]. Many TREC tracks over the years have evaluated run submissions using the trec_evalprogram, which calculates Mean Average Precision, along with several other evaluation metrics. Much of the published research in the information retrieval field over the last 25 years relies on observed difference in MAP to draw conclusions about the effectiveness of a studied technique or system relative to a...
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsRecommended Reading
National Institute of Standards and Technology. TREC-2004 common evaluation measures. Available online at: http://trec.nist.gov/pubs/trec14/appendices/CE.MEASURES05.pdf. Retrieved on 27 Aug 2007.
Sakai T. Alternatives to BPref. In: Proceedings of the 30th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval; 2007. p. 71–8.
Author information
Authors and Affiliations
Corresponding authors
Editor information
Editors and Affiliations
Section Editor information
Rights and permissions
Copyright information
© 2018 Springer Science+Business Media, LLC, part of Springer Nature
About this entry
Cite this entry
Beitzel, S.M., Jensen, E.C., Frieder, O. (2018). MAP. In: Liu, L., Özsu, M.T. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8265-9_492
Download citation
DOI: https://doi.org/10.1007/978-1-4614-8265-9_492
Published:
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4614-8266-6
Online ISBN: 978-1-4614-8265-9
eBook Packages: Computer ScienceReference Module Computer Science and Engineering