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Lee, Guemin – Applied Measurement in Education, 2000
Investigated incorporating a testlet definition into the estimation of the conditional standard error of measurement (SEM) for tests composed of testlets using five conditional SEM estimation methods. Results from 3,876 tests from the Iowa Tests of Basic Skills and 1,000 simulated responses show that item-based methods provide lower conditional…
Descriptors: Error of Measurement, Estimation (Mathematics), Simulation, Test Construction

Lee, Guemin; Dunbar, Stephen B.; Frisbie, David A. – Educational and Psychological Measurement, 2001
Conceptualized eight different types of measurement models for a test composed of testlets and studied the goodness of fit of those models to data using data from the Iowa Tests of Basic Skills and simulated data. The essentially tau-equivalent model and the congeneric model provided worse model fit than the other measurement models. (SLD)
Descriptors: Goodness of Fit, Measurement Techniques, Models, Scores