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PV + = True positives / All
positives a / (a+b) = 95 / 185 = 51.4% PV - = True negatives / All negatives d / (c+d) = 810 / 815 = 99.4% Efficiency of the Test = Total correct / Total predictions (a+d) / (a+b+c+d) = (95 + 810) / 1000 = 90.5% |