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Holmes, Susan E.; Doody-Bogan, Evelyn N. – 1983
The accuracy of trait estimates obtained from three vertical equating methods was examined. The procedures studied included two anchor test designs and a single-group design. Data from two content areas and two grade combinations were studied. A three-parameter logistic model was used to perform the equatings. The results obtained were used to…
Descriptors: Achievement Tests, Equated Scores, Estimation (Mathematics), Latent Trait Theory
