Data points (representing the X, Y and Z coordinates of each point) in this graph are represented in 3D space as "deviations" from a specified base- level of the Z-axis. One component graph is produced for each level of the
grouping variable (or user-defined subset of data) and all the component graphs are arranged in one display to allow for comparisons between the subsets of data (categories).
For a detailed discussion of Categorized Graphs, see Categorized Graphs in Selected Topics in Graphical Analytic Techniques.
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