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Educational and Psychological Measurement
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An Empirical Test of Roskam's Conjecture about the Interpretation of an ICC Parameter in Personality Inventories

Bruno D. Zumbo

University of Northern British Columbia, zumbob{at}unbc.ca

Gregory A. Pope

University of Northern British Columbia

Jackie E. Watson

University of Northern British Columbia

Anita M. Hubley

University of Northern British Columbia

Roskam conjectured in 1985 that a general interpretation can be made for the a-parameter (slope) in an item response theory (IRT) analysis of personality inventories. That is, Roskam suggested that steeper slopes (and hence higher item-total correlations in classical test theory) will be found with more concretely worded items, whereas lower slopes will be found with more abstractly worded items. The authors tested this conjecture using item-total correlations and both two- and three-parameter IRT models with the Eysenck Personality Questionnaire and were unable to support Roskam's proposed interpretation.

Educational and Psychological Measurement, Vol. 57, No. 6, 963-969 (1997)
DOI: 10.1177/0013164497057006006
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