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An Empirical Test of Roskam's Conjecture about the Interpretation of an ICC Parameter in Personality Inventories.
Peer reviewed Peer reviewed
Zumbo, Bruno D.; Pope, Gregory A.; Watson, Jackie E.; Hubley, Anita M. – Educational and Psychological Measurement, 1997
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).…
Descriptors: Correlation, Personality Assessment, Personality Measures, Test Interpretation
DICOT: Analyzing Classroom Tests with the Rasch Model.
Peer reviewed Peer reviewed
Masters, Geofferey N. – Educational and Psychological Measurement, 1984
DICOT, a computer program for the Rasch analysis of classroom tests, is described. Results are presented in a self-explanatory form. Person ability and item difficulty estimates are expressed in a familiar metric. Person and item fit statistics provide a diagnosis of individual children and identification of problematic items. (Author/DWH)
Descriptors: Classroom Techniques, Foreign Countries, Item Analysis, Latent Trait Theory
An Empirical Investigation of the Standard Error of Measurement at Different Ability Levels.
Peer reviewed Peer reviewed
Blixt, Sonya L.; Shama, Deborah D. – Educational and Psychological Measurement, 1986
Methods of estimating the standard error at different ability levels were compared. Overall, it was found that at a given ability level the standard errors calculated using different formulas are not appreciably different. Further, for most situations the traditional method of calculating a standard error probably provides sufficient precision.…
Descriptors: College Freshmen, Error of Measurement, Higher Education, Mathematics Achievement