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Educational and Psychological Measurement
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A Program for Computing an Index of Scale Unidimensionality

John K. Butler, Jr.

Clemson University

After briefly explaining an index of homogeneity for the items of a measurement scale, this paper describes a program that computes the index. Written in SAS, the program converts an output data set created by a factor analysis to two matrices: (a) the absolute values of the interitem correlations and (b) the item commonalities. These matrices are used to calculate the index.

Educational and Psychological Measurement, Vol. 43, No. 3, 845-847 (1983)
DOI: 10.1177/001316448304300322
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