WHAT IS COEFFICIENT ALPHA - AN EXAMINATION OF THEORY AND APPLICATIONS
WHAT IS COEFFICIENT ALPHA - AN EXAMINATION OF THEORY AND APPLICATIONS
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DOI：
10.1037/0021-9010.78.1.98
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发表时间：
1993-02-01
影响因子：
9.9
通讯作者：
CORTINA, JM
中科院分区：
文献类型：
--
作者：
CORTINA, JM
由于普遍缺乏对系数α和信度理论的总体理解，涉及量表构建的心理学研究受到了相当大的阻碍。讨论了系数α的假设和意义。在此讨论之后，通过计算具有不同项目数、正交维数目和平均项目相关性的假设测试的统计量，展示了测试长度和维度对α的影响。对系数α的正确使用提出了建议。
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 for the proper use of coefficient alpha are offered.