Area Under the ROC Curve (AUC)


From Signal Detection Theory, a summary measure used to assess the quality of Prioritization. AUC is the Probability that a randomly chosen Relevant Document is given a higher priority than a randomly chosen Non-Relevant Document. An AUC score of 100% indicates a perfect ranking, in which all Relevant Documents have higher priority than all Non-Relevant Documents. An AUC score of 50% means the Prioritization is no better than chance. 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).