assign_colors           Assign Colors Based on Tertiles
calculate_tertile_breaks
                        Calculate Tertile Breaks
calculate_tertiles      Calculate Tertiles for Bivariate Variables
create_bivariate_map    Create Bivariate Choropleth Map
create_default_color_matrix
                        Create Default Color Matrix for Bivariate
                        Choropleth
dc_data                 Washington DC Census Tract Data
generate_legend_html    Generate Legend HTML
