Ordinal,interval,and ratio measures must occur on scales that are restricted to positive integers.

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Ordinal, interval, and ratio measures do not necessarily have to be restricted to positive integers. They can also include negative values and fractions. For example, temperature measured on the Celsius scale is an interval measure that includes negative values, and weight measured in kilograms is a ratio measure that can include decimal fractions.

Ordinal,interval,and Ratio Measures Must Occur on Scales That Are Restricted