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The table below gives dprimes for combinations of true positive and false positive rates. Remember that a rate of 0.5, or 50%, is equivalent to merely a chance occurrence. Dprimes greater than 2, regarded as atypical by the UCLA statistics department, are in italics. False Alarm Rate True Positive Rate 0.05 0.1 0.15 0.2 0.3 0.4 0.5 0.99 3.97 3.60 3.36 3.16 2.85 2.58 2.45 0.95 3.28 2.93 2.68 2.49 2.17 1.90 1.77 0.90 2.93 2.56 2.32 2.12 1.81 1.53 1.41 0.85 2.68 2.32 2.07 1.88 1.56 1.29 1.16 0.80 2.49 2.12 1.88 1.68 1.37 1.09 0.97 0.70 2.17 1.81 1.56 1.37 1.05 0.78 0.65 0.60 1.90 1.53 1.29 1.09 0.78 0.51 0.38 0.50 1.65 1.28 1.04 0.84 0.52 0.25 0.13