create_distance_suitability_plot
                        Create distance–suitability plot
ecdf_compare_niche      Simulations and analyses of Mahalanobis
                        distance-based habitat suitability
ecdf_nonnormal_niche    Compare ECDF and Chi-square suitability under
                        non-normal data
ecdf_theoretical_niche
                        Niche analysis using ECDF and chi-squared
mahal.dist              Mahalanobis Distance Classifier for Ecological
                        Niche Modeling
run_ecdf_mahal_analysis
                        Run full ECDF–Mahalanobis analysis
