A vector of actuals values (numeric or ordered factor)
returnDT
If TRUE, a data.table of (FalsePositiveRate, TruePositiveRate) pairs is returned, otherwise AUC ROC score is returned
Details
If returnDT=FALSE, returns Area Under the ROC Curve.If returnDT=TRUE, returns a data.table object with
False Positive Rate and True Positive Rate for plotting the ROC curve.