Error / Error Rate


The fraction of all Documents that are incorrectly coded by a search or review effort. Note that Accuracy + Error = 100%, and that 100% – Accuracy = Error. While a low Error Rate is commonly advanced as evidence of an effective search or review effort, its use can be misleading because it is heavily influenced by Prevalence. Consider, for example, a Document Population containing one million Documents, of which ten thousand (or 1%) are Relevant. A search or review effort that found none of the relevant Documents would have 1% Error, belying the failure of the search or review effort. 1


  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).