Estimation of reliability: a better alternative for Cronbach's alpha
Estimation of reliability: a better alternative for Cronbach's alpha
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可靠性估计：Cronbachs alpha 的更好替代方案
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
L. Tarkkonen
中科院分区：
文献类型：
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作者：
K. Vehkalahti;S. Puntanen;L. Tarkkonen
研究了测量量表信度的估计问题。这个问题已经部分被掩盖，因为穷人的估计，如克朗巴赫的阿尔法，这是最广泛应用的可靠性估计。我们表明，最近提出的估计，我们称之为Tarkkonen的ρ，提供了一个通用的方法的任务。检查这些估计背后的假设，我们证明克朗巴赫的阿尔法是一个特殊的情况下Tarkkonen的ρ在某些一维测量模型。在实践中，Cronbach的α是一个有效的可靠性估计所需的条件是很难遇到的，whereasTarkkonen的ρ是非常适合更一般的测量设置。我们的结论是，Tarkkonen的rho是一个更好的替代克朗巴赫的α。
We study the estimation of the reliability of measurement scales. The subject has been partially obscured because of poor estimators, such as Cronbach’s alpha, which is the most widely applied estimator of reliability. We show that a recently proposed estimator that we are calling Tarkkonen’s rho, provides a general method for the task. Examining the assumptions behind these estimators we prove that Cronbach’s alpha is a special case of Tarkkonen’s rho under certain one-dimensional measurement models. In practice, the conditions required for Cronbach’s alpha to be a valid estimator of reliability are difficult to encounter, whereasTarkkonen’s rho is well suited for more general measurement settings. Our conclusion is that Tarkkonen’s rho is a better alternative for Cronbach’s alpha.