What Is Coefficient Alpha? An Examination of Theory and Applications
作者： Jose M. Cortina
DOI: 10.1037/0021-9010.78.1.98
关键词:
摘要: Psychological research involving scale construction has been hindered considerably by a widespread lack of understanding of coefficient alpha and reliability theory in general. A discussion of the assumptions and meaning of coefficient alpha is presented. This discussion is followed by a demonstration of the effects of test length and dimensionality on alpha by calculating the statistic for hypothetical tests with varying numbers of items, numbers of orthogonal dimensions, and average item intercorrelations. Recommendations …
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