Characteristics of individuals, usually quantified, such as blood pressure, age, income or region of residence will vary and, hence, are termed 'variables'. So
362 Variable-by-Variable Analysis are other elements in a model that can vary but are not characteristics of people, such as inputs, price, GDP or industrial concentration. Some variables are binary. Such variables usually indicate either the presence or the absence of a feature of interest (such as male or female, black or white, alive or dead). Cf. Parameter.
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