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Applied Psychological Measurement
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What's this?

Comparison of IRT True-Score and Equipercentile Observed-Score "Equatings"

Frederic M. Lord

Educational Testing Service, Princeton NJ 08541, U.S.A.

Marilyn S. Wingersky

Educational Testing Service, Princeton NJ 08541, U.S.A.

Two methods of 'equating' tests are compared, one using true scores, the other using equipercentile equat ing of observed scores. The theory of equating is dis cussed. For the data studied, the two methods yield almost indistinguishable results.

Applied Psychological Measurement, Vol. 8, No. 4, 453-461 (1984)
DOI: 10.1177/014662168400800409
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