DuoScattorPlot          Generate Scatter Plots for Time-to-Event and
                        Biomarkers for Two Groups
DuoWPCCurve             Generate Two Weighted Predictiveness Curves in
                        Graph
SoloScattorPlot         Generate Scatter Plots for Time-to-Event and
                        Biomarkers for One Group
SoloWPCCurve            Generate Single Weighted Predictiveness Curve
                        in Graph
TrioScattorPlot         Generate Scatter Plots for Time-to-Event and
                        Biomarkers for Three Groups
TrioWPCCurve            Generate Three Weighted Predictiveness Curves
                        in Graph
WPC-package             Implement Weighted Predictiveness Curve to
                        Visualize the Marker-by-Treatment Relationship
                        and Measure the Performance of Biomarkers for
                        Guiding Treatment Decision.
cox.wpc.est             Generate Weighted Predictiveness Curve
                        Estimates Using Parametric Approach.
npr.wpc.est             Generate Weighted Predictiveness Curve
                        Estimates Using Non-Parametric Approach.
ns.windows              Create a Series of Overlapping Windows by
                        Fixing Number of Patients within each Window
surv.rate               Calculate Survival Rate at a Fix Time Point
wpcdata                 A Data Example to Illustrate WPC Approach.
ww.windows              Create a Series of Overlapping Windows by
                        Fixing Biomarker Scale Window Width
