From Open Risk Manual


The c-statistic, also known as AUROC (area under the curve), the concordance statistic, is equal to to the AUC (area under curve)


  • The closer the value is to 1, the better the model's classification performance
  • A value of 0.5 indicates that the model is no better than classifying outcomes randomly
  • A value below 0.5 means that using the opposite of the model classification is actually a better choice!