Unitary Measures

This chapter considers unitary measures of test outcome which can be derived from the 2 × 2 contingency tableContingency table. In different disciplines, different measures are typically used, for example Youden indexYouden index (Y) or statistic (J) in medical decision making and F measureF measure (F1) in information retrieval and machine learning. Of these various measures, Matthews’ correlation coefficientMatthews’ Correlation Coefficient (MCC) may be the optimal choice.