
300 Empirical Research in Software Engineering
lead to a decrease in the value of specicity. ROC curve starts from the origin and moves
toward the upper-right portion of the graph, as can be seen from Figure7.13. The ends
of the curve meet the end points of the diagonal line. The closer the curve is toward the
left-hand border and the top border of the ROC graph, the more accurate is the prediction
capability of the model. In contrast, the closer the curve comes to the 45-degree diagonal
of the ROC graph, the less accurate is the model prediction.
7.5.6.2 Area Under the ROC Curve
The prediction capability of the model depends on the degree to ...