Categorical Pretreatment Standard A technology-based effluent limitation for an industrial facility discharging into a municipal sewer system. Analogous in stringency to Best Available Technology (BAT) for direct dischargers. Categorical Variable (Statistics) A qualitative variable created by classifying observations into categories. For example, a series of household incomes could be classified into the categorical variables low, medium, and high describing certain specific ranges of income levels. Many statistical techniques are inappropriate for the use of categorical variables. Also referred to as a Qualitative Variable. Contrast with Quantitative Variable.
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Author of the Water Words Dictionary source of text: Gary A. Horton
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