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Seo, Minhee; Roussos, Louis A. – Journal of Educational Measurement, 2010
DIMTEST is a widely used and studied method for testing the hypothesis of test unidimensionality as represented by local item independence. However, DIMTEST does not report the amount of multidimensionality that exists in data when rejecting its null. To provide more information regarding the degree to which data depart from unidimensionality, a…
Descriptors: Effect Size, Statistical Bias, Computation, Test Length