Uses and abuses of coefficient alpha
Uses and abuses of coefficient alpha
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DOI：
10.1037/1040-3590.8.4.350
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发表时间：
1996-12-01
影响因子：
3.6
通讯作者：
Schmitt, N
中科院分区：
文献类型：
--
作者：
Schmitt, N
这篇文章解决了一些关于如何报告和使用系数alpha的问题。它还表明alpha不是同质性或一维性的度量。这一事实和发现，测试长度与可靠性可能会导致重大误解的措施时，α被用作证据，一个措施是一维的。对于多维测量，使用α作为衰减校正的基础会导致高估真实相关性。α的满意水平取决于测试的使用和解释。即使相对较低（例如，.50）标准可靠性水平不会严重削弱有效性系数。在报告应可辨别的测量之间的相互关系时，重要的是要呈现观察到的相关性，适当的可靠性测量，以及校正不可靠性的相关性。
The article addresses some concerns about how coefficient alpha is reported and used. It also shows that alpha is not a measure of homogeneity or unidimensionality. This fact and the finding that test length is related to reliability may cause significant misinterpretations of measures when alpha is used as evidence that a measure is unidimensional. For multidimensional measures, use of alpha as the basis for corrections for attenuation causes overestimates of true correlation. Satisfactory levels of alpha depend on test use and interpretation. Even relatively low (e.g., .50) levels of criterion reliability do not seriously attenuate validity coefficients. When reporting intercorrelations among measures that should be discriminable, it is important to present observed correlations, appropriate measures of reliability, and correlations corrected for unreliability.