Accuracy

Definition(s)

The fraction of Documents that are correctly coded by a search or review effort. Note that Accuracy + Error = 100%, and that Accuracy = 100% – Error. While high Accuracy 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 identified 100% of the Documents as Not Relevant and therefore, found none of the Relevant Documents, would have 99% Accuracy, belying the failure of that search or review effort. 1

Notes

  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).