boxplot3d               Draw a 3-axis (triaxial) box plot
boxplot3d_interactive   Draw an interactive, rotatable 3-axis
                        (triaxial) box plot
boxplot3d_significance
                        Significance testing for a 3-axis (triaxial)
                        box plot
chisq_plot3d            Draw a chi-square association plot
                        (standardized residuals per cell)
irt_plot3d              Draw a 3D Item Response Theory (IRT) map:
                        characteristic curves + double histogram
manova_plot3d           Draw more-than-2 groups as bivariate 3D
                        "mountains" with pairwise post-hoc tests
paired_plot3d           Draw a paired (pre/post) comparison on two
                        variables as a 3D "spaghetti" plot
ttest_plot              Draw a t-distribution curve with the observed
                        statistic and critical region
ttest_plot3d            Draw two groups as bivariate 3D "mountains"
                        with their overlap and joint test
