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Split-half reliability

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Split-half reliability treats the two halves of a measure as alternate forms. This "halves reliability" estimate is then stepped up to the full test length using the Spearman-Brown prediction formula. This is sometimes referred to as the coefficient of internal consistency. The most common internal consistency measure is Cronbach's alpha, which is usually interpreted as the mean of all possible split-half coefficients.[1] Cronbach's alpha is a generalization of an earlier form of estimating internal consistency, Kuder-Richardson Formula 20.[1]

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