• The fraction of Documents in a Population that are Relevant to an Information Need. Also referred to as Richness or Yield. 1
  • The richness or proportion of responsive documents in a collection. More broadly, the prevalence refers to the proportion of one kind of item in a population of items. 2


  1. Maura R. Grossman and Gordon V. Cormack, EDRM page & The Grossman-Cormack Glossary of Technology-Assisted Review, with Foreword by John M. Facciola, U.S. Magistrate Judge2013 Fed. Cts. L. Rev. 7 (January 2013).
  2. Herb Roitblat, Predictive Coding Glossary.
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