A reanalysis of data from Hambleton and Rovinelli (1986) argues that the methods suggested by Bejar (1980) are a valuable descriptive tool for assessing the unidimensionality assumption when a priori informa tion is available about possible response factors. Index terms: achievement testing, item response theory, uni dimensionality.
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References
1.
Bejar, I.I. (1980). A procedure for investigating the unidimensionality of achievement tests based on item parameter estimates. Journal of Educational Measurement, 17, 283-296.
2.
Hambleton, R.K., & Rovinelli, R.J. (1986). Assessing the dimensionality of a set of test items. Applied Psychological Measurement , 10, 287-302.
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Henning, G., Hudson, T., & Turner, J. (1985). Item response theory and the assumption of unidimensionality for language tests. Language Testing, 2, 141-154.
