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A reliability coefficient for criterion‐referenced tests is developed from the assumptions of classical test theory. This coefficient is based on deviations of scores from the criterion score, rather than from the mean. The coefficient is shown to have several of the important properties of the conventional normreferenced reliability coefficient, including its interpretation as a ratio of variances and as a correlation between parallel forms, its relationship to test length, its estimation from a single form of a test, and its use in correcting for attenuation due to measurement error. Norm‐referenced measurement is considered as a special case of criterion‐referenced measurement.
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Samuel A. Livingston (1972) studied this question.
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