Encyclopedia of Database Systems

2009 Edition
| Editors: LING LIU, M. TAMER ÖZSU

R-Precision

  • Nick Craswell
Reference work entry
DOI: https://doi.org/10.1007/978-0-387-39940-9_486

Definition

For a given query topic Q, R-precision is the precision at R, where R is the number of relevant documents for Q. In other words, if there are r relevant documents among the top-R retrieved documents, then R-precision is \({r}\over{R}\)

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Nick Craswell
    • 1
  1. 1.Microsoft Research CambridgeCambridgeUK