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Applied Psychological Measurement
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Conditional Covariance-Based Representation of Multidimensional Test Structure

Daniel M. Bolt

University of Wisconsin, Madisondmbolt{at}facstaff.wisc.edu.

A new nonparametric method for constructing a spatial representation of multidimensional test structure is presented. CCSCAL (for Conditional Covariance-based SCALing) constructs an item vector representation of test structure using conditional covariance-based scaling. A conditional covariance-based dissimilarity measure between items, and a form of multidimensional scaling in which dissimilarities are represented by angles between vectors, are used. This method can be used to investigate a broad range of multidimensional test structures. An index is described to measure the accuracy of the representation. Several simulated and real-data analyses show that the method provides a suitable approximation to multidimensional test structures.

Applied Psychological Measurement, Vol. 25, No. 3, 244-257 (2001)
DOI: 10.1177/01466210122032055
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