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Congeneric and (essentially) tau-equivalent estimates of score reliability - What they are and how to use them

机译：分数可靠性的通用和（基本上）tau等效估计-它们是什么以及如何使用它们

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摘要

Coefficient alpha, the most commonly used estimate of internal consistency, is often considered a lower bound estimate of reliability, though the extent of its underestimation is not typically known. Many researchers are unaware that coefficient alpha is based on the essentially tau-equivalent measurement model. It is the violation of the assumptions required by this measurement model that are often responsible for coefficient alpha's underestimation of reliability. This article presents a hierarchy of measurement models that can be used to estimate reliability and illustrates a procedure by which structural equation modeling can be used to test the fit of these models to a set of data. Test and data characteristics that can influence the extent to which the assumption of tau-equivalence is violated are discussed. Both heuristic and applied examples are used to augment the discussion.
机译：系数α是内部一致性最常用的估计，尽管通常不知道其低估的程度，但通常将其视为可靠性的下界估计。许多研究人员没有意识到系数α是基于本质上等于tau的测量模型。正是这种测量模型所要求的假设的违反经常导致系数α的可靠性低估。本文介绍了可用于估计可靠性的度量模型层次结构，并说明了一种过程，通过该过程可使用结构方程建模来测试这些模型对一组数据的拟合度。讨论了可能影响tau等效假设被违反程度的测试和数据特征。启发式和应用示例均用于扩大讨论范围。

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