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Test-Free Person Measurement with the Rasch Simple Logistic Model

Howard E. A. Tinsley, Department of Psychology, Southern Illinois University, Carbondale, IL 62901

René V. Dawis

University of Minnesota

This research investigated the use of the Rasch simple logistic model in obtaining test-free ability estimates. Two tests each of word, picture, symbol, and number analogies were administered to college and high school students. Differences between scores on each pair of tests were analyzed to deter mine whether the ability estimates were independ ent of the tests employed. The results indicate that raw-score ability estimates are influenced by the difficulty of the items used in measurement but that Rasch ability estimates are relatively independ ent of the difficulty of these items. The need is dis cussed for additional research in which an indi vidualized item-presentation procedure is used with the Rasch model.

Applied Psychological Measurement, Vol. 1, No. 4, 483-487 (1977)
DOI: 10.1177/014662167700100404


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