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Doody-Bogan, Evelyn N.	1
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An Empirical Study of Vertical Equating Methods Using the Three-Parameter Logistic Model.

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

Using Simulation Results When Choosing a Latent-Trait Model.

Yen, Wendy M. – 1979

Three test-analysis models were used to analyze three types of simulated test score data plus the results of eight achievement tests. Chi-square goodness-of-fit statistics were used to evaluate the appropriateness of the models to the four kinds of data. Data were generated to simulate the responses of 1,000 students to 36 pseudo-items by…

Descriptors: Achievement Tests, Correlation, Goodness of Fit, Item Analysis