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ROC curve analysis: Criterion and criterion value

In ROC curve analysis, MedCalc does not simply reports threshold or criterion values, but it reports the criterion values with a comparison sign, turning the criterion value into a criterion or indicator of disease.

For example,

To determine the sign or direction (< or >) of the criterion, MedCalc's decision rule is based on the fact that the AUC cannot be less than 0.5. If the AUC is less than 0.5, the decision rule must be reversed (Zweig & Campbell, 1993).

MedCalc proceeds as follows:


See also