Download e-book for iPad: New Horizons in Testing. Latent Trait Test Theory and by David J. Weiss

By David J. Weiss

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Hambleton, R. , & Traub, R. E. Analysis of empirical data using two logistic latent trait models. British Journal of Mathematical and Statistical Psychology, 1973,26, 195-211. on, R. , & Traub, R. E. The robustness of the Rasch test model (Report No. 42). Amherst: University of Massachusetts, School of Education, Laboratory of Psychometric and Evaluative Research, 1976. Lord, F. M. An analysis of the Verbal Scholastic Aptitude Test using Birnbaum's threeparameter logistic model. Educational and Psychological Measurement, 1968, 28, 989-1020.

68 SHAPE OF THE ABILITY DISTRIBUTION As expected, correlations tended to be higher for the uniformly distributed ability scores because score variability was increased. TEST LENGTH Increases in correlations were observed because of the doubling of the length of the test. The increases were small as would be predicted from the well-known formulas linking test length to test validity. Conclusions It is clear from the data that with modest test lengths (n == 20) there are some sizable gains to be expected in the correct ordering of examinees at the lower end of the ability continuum when three-parameter model estimates are used (as opposed to the number-correct score).

Amherst: University of Massachusetts, School of Education, Laboratory of Psychometric and Evaluative Research, 1979. Dinero, T. , & Haertel, E. Applicability of the Rasch model with varying item discriminations. Applied Psychological Measurement, 1977,1, 581-592. 2. ROBUSTNESS OF ITEM RESPONSE MODELS 49 Gulliksen, H. Theory of mental tests. New York: Wiley, 1950. Hambleton, R. K. An empirical investigation of the Rasch test theory model. Unpublished doctoral dissertation, University of Toronto, 1969.

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