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

E. Roskam's (1985) conjecture that steeper item characteristic curve (ICC) "a" parameters (slopes) (and higher item total correlations in classical test theory) would be found with more concretely worded test items was tested with results from 925 young adults on the Eysenck Personali...

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Bibliographic Details
Published inEducational and psychological measurement Vol. 57; no. 6; p. 963
Main Authors Zumbo, Bruno D, Pope, Gregory A, Watson, Jackie E, Hubley, Anita M
Format Journal Article
LanguageEnglish
Published 01.12.1997
Subjects
Correlation
Eysenck Personality Inventory
Item Characteristic Function
Personality Assessment
Personality Measures
Test Interpretation
Test Items
Test Theory
Young Adults
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Summary:E. Roskam's (1985) conjecture that steeper item characteristic curve (ICC) "a" parameters (slopes) (and higher item total correlations in classical test theory) would be found with more concretely worded test items was tested with results from 925 young adults on the Eysenck Personality Questionnaire (H. Eysenck and S. Eysenck, 1975). Results did not support Roskam's proposed interpretation. (SLD)
ISSN:0013-1644
DOI:10.1177/0013164497057006006