interval scale

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June 29, 2026

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An interval scale is a type of measurement scale used in statistical analysis. It provides information about the amount of difference between values, and the differences between adjacent numbers are equal or known. However, an interval scale lacks a true zero point, meaning zero does not indicate the complete absence of the characteristic being measured. Examples include the Fahrenheit and Celsius temperature scales, where 0°F or 0°C does not mean there is no temperature.1

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Types of measurement scales
An interval scale has equal units and an arbitrarily assigned zero point; one such scale, for example, is the Fahrenheit temperature scale. Ratio scales not only provide equal units but also have absolute zero points; examples include measures of weight and distance.
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An interval scale has equal units and an arbitrarily assigned zero point; one such scale, for example, is the Fahrenheit temperature scale. Ratio scales not only provide equal units but also have absolute zero points; examples include measures of weight and distance.
Read More