aspect_importance       Calculates importance of variable groups
                        (called aspects) for a selected observation
aspect_importance_single
                        Aspects importance for single aspects
calculate_triplot       Calculate triplot that sums up automatic
                        aspect/feature importance grouping
cluster_variables       Creates a cluster tree from numeric features
get_sample              Function for getting binary matrix
group_variables         Helper function that combines clustering
                        variables and creating aspect list
hierarchical_importance
                        Calculates importance of hierarchically grouped
                        aspects
list_variables          Cuts tree at custom height and returns a list
plot.aspect_importance
                        Function for plotting aspect_importance results
plot.cluster_variables
                        Plots tree with correlation values
plot.triplot            Plots triplot
print.aspect_importance
                        Function for printing aspect_importance results
