PV.BR                   Function to compute PPV and NPV with specified
                        base rates
ROC.data.ex             Example data
ROC.stats               Function to compute statistics from a confusion
                        matrix
cutscores               Function to compute optimal cut-off scores
group.auc.test          Function to compare AUC across all consecutive
                        categories of an ordinal scale
group.to.vars           Function to create new variables from the
                        ordinal variable for further analysis
