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Sensitivity = a/(a+c); the probability of having a positive test if you are positiveSpecificity = d/(b+d); the probability of having a negative test if you are negative Positive Predictive Value = a/(a+b); the probability of having the disease if you test positive Negative Predictive Value = d/(c+d); the probability of not having the disease if you test negative Prevalence = (a+c)/(a+b+c+d) Accuracy (efficiency of test) = (a+d)/(a+b+c+d) |