WHAT IS COEFFICIENT ALPHA - AN EXAMINATION OF THEORY AND APPLICATIONS
成果类型：
Article
署名作者：
CORTINA, JM
刊物名称：
JOURNAL OF APPLIED PSYCHOLOGY
ISSN/ISSBN：
0021-9010
DOI：
10.1037/0021-9010.78.1.98
发表日期：
1993
页码：
98-104
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 for the proper use of coefficient alpha are offered.
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