Congeneric and (essentially) tau-equivalent estimates of score reliability - What they are and how to use them
Congeneric and (essentially) tau-equivalent estimates of score reliability - What they are and how to use them
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DOI：
10.1177/0013164406288165
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发表时间：
2006-12-01
影响因子：
2.7
通讯作者：
Graham, James M.
中科院分区：
文献类型：
--
作者：
Graham, James M.
系数α是最常用的内部一致性估计，通常被认为是可靠性的下限估计，尽管其低估的程度通常不知道。许多研究人员不知道系数α是基于基本上τ等效的测量模型。这是违反了这个测量模型所要求的假设，往往是负责系数α的低估的可靠性。本文提出了一个层次结构的测量模型，可用于估计可靠性，并说明了一个程序，结构方程模型可以用来测试这些模型的拟合一组数据。测试和数据的特点，可以影响到的程度，违反了假设的τ-等效进行了讨论。启发式和应用的例子来增加讨论。
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.