Limitations of Coefficient Alpha as an Index of Test Unidimensionality.

Green, Samual B.; And Others

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Peer reviewed

ERIC Number: EJ180466

Record Type: Journal

Publication Date: 1977

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Limitations of Coefficient Alpha as an Index of Test Unidimensionality

Green, Samual B.; And Others

Educational and Psychological Measurement, 37, 4, 827-38, W 77

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. This misuse is discussed and several indices of item homogeneity derived from the model of common factor analysis are offered as alternatives. (Author/JKS)

Descriptors: Factor Analysis, Item Analysis, Test Interpretation, Test Items, Test Reliability

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