This "halves reliability" estimate is then stepped up to the full test length using the Spearman-Brown prediction formula. Split-half reliability treats the two halves of a measure as alternate forms.Single-administration methods include split-half and internal consistency. This is sometimes known as the coefficient of equivalence Alternate forms reliability is estimated by the Pearson product-moment correlation coefficient of two different forms of a measure, usually administered together. This is sometimes known as the coefficient of stability Test-retest reliability, is estimated as the Pearson product-moment correlation coefficient between two administrations of the same measure.Multiple-administration methods require that two assessments are administered. Reliability may be estimated through a variety of methods that fall into two types: single-administration and multiple-administration.
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