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see https://www.perceptualedge.com/articles/.../quant_vs_cat_data.pdf http://peltiertech.com/excel-category-axis-types/

see https://www.perceptualedge.com/articles/.../quant_vs_cat_data.pdf http://peltiertech.com/excel-category-axis-types/ https://en.wikipedia.org/wiki/List_of_analyses_of_categorical_data