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Limitations of Coefficient Alpha as an Index of Test Unidimensionality1

Samuel B. Green

Auburn University

Robert W. Lissitz

University of Georgia

Stanlen A. Mulaik

Georgia Institute of Technology

Confusion in the literature between the concepts of internal consistency and homogeneity has led to a misuse of coefficient alpha as an index of item homogeneity. Coefficient alpha is actually a complexly determined test statistic, item homogeneity only being one influence on its magnitude. The related statistic, the average intercorrelation, has similar difficulties. Several indices of item homogeneity derived from the model of common factor analysis are offered as alternatives.

Educational and Psychological Measurement, Vol. 37, No. 4, 827-838 (1977)
DOI: 10.1177/001316447703700403


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