add_colored_box         Add a box with specified color in an R Markdown
                        file.
add_colored_str         Add a string with specified color or background
                        color.
color_set_palette       Generate a color vector
color_test_palette      Test a color vector
time_plot_event         Plot labeled events
time_plot_interval      Plot periods of events
trans_composition       Transformation for continuous data with a
                        finite number of distinct values
trans_loglinear         Transformation for continuous data with a
                        finite number of distinct values
