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- Sensitivity= a/(a+c)

- Specificity= d/(b+d)

- Predictive value of a positive test ( PVT+) = a/(a+b)

- Predictive value of a negative test (PVT-) = d/(c+d)

- Percentage of correct classification
  (PCC) = (a+d)/(a+b+c+d)

- Bias = (a+b)/(a+c)