ParallelTree - Visualizing Multilevel Data with Parallel Tree Plots
Provides two functions: Group_function() and
Parallel_Tree(). Group_function() applies a given function
(e.g., mean()) to input variable(s) by group across levels of a
multilevel data structure, with additional data management
options. Parallel_Tree() uses 'ggplot2' to create parallel
coordinate plots (technically a facsimile of parallel
coordinate plots in a Cartesian coordinate system). Used in
combination, these functions can create parallel tree plots, a
variant of parallel coordinate plots useful for visualizing
multilevel data.
