.createPPVmatrix        .createPPVmatrix
.get_point_ppv_npv      .get_point_ppv_npv
.number_decimals_plot_axis
                        .number_decimals_plot_axis
.plot_creation          .plot_creation
.plot_overlay_area      .plot_overlay_area
.plot_overlay_line      .plot_overlay_line
.translate_labels       .translate_labels
PPV_diagnostic_vs_screening
                        Plot PPV values for a diagnostic and a
                        screening group
PPV_heatmap             Plot PPV and NPV heatmaps
min_possible_prevalence
                        Show minimum possible prevalence given the test
                        characteristics
