This type of graph produces multiple spectral plots (for subsets of data determined by the selected categorization method) arranged in one display to allow for comparisons between the subsets of data. Values of variables X and Z are interpreted as the X- and Z-axis coordinates of each point, respectively; values of variable Y are clustered into equally-spaced values, corresponding to the locations of the consecutive spectral planes (see graph number 3, above).
For a detailed discussion of Categorized Graphs, see
Categorized Graphs in
Selected Topics in Graphical Analytic Techniques.
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