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| Educational and Psychological… | 2 |
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| Dunbar, Stephen B. | 2 |
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Peer reviewedMartin, David J.; Dunbar, Stephen B. – Educational and Psychological Measurement, 1985
The factorial validity of the Iowa Tests of Basic Skills was investigated. Hierarchical factor analysis was performed with a subset of the standardization data to explore the presence of second-order group factors. Results supported the construct validity of Language and Mathematics subscales. Verbal and Visual Information group factors were…
Descriptors: Achievement Tests, Factor Analysis, Factor Structure, Intermediate Grades
Peer reviewedLee, 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
