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Adaptive Estimation When the Unidimensionality Assumption of IRT Is Violated.
Peer reviewed Peer reviewed
Folk, Valerie Greaud; Green, Bert F. – Applied Psychological Measurement, 1989
Some effects of using unidimensional item response theory (IRT) were examined when the assumption of unidimensionality was violated. Adaptive and nonadaptive tests were used. It appears that use of a unidimensional model can bias parameter estimation, adaptive item selection, and ability estimation for the two types of testing. (TJH)
Descriptors: Ability Identification, Adaptive Testing, Computer Assisted Testing, Computer Simulation
Adaptive and Conventional Versions of the DAT: The First Complete Test Battery Comparison.
Peer reviewed Peer reviewed
Henly, Susan J.; And Others – Applied Psychological Measurement, 1989
A group of covariance structure models was examined to ascertain the similarity between conventionally administered and computerized adaptive versions of the Differential Aptitude Test (DAT). Results for 332 students indicate that the computerized version of the DAT is an adequate representation of the conventional test battery. (TJH)
Descriptors: Ability Identification, Adaptive Testing, Comparative Testing, Computer Assisted Testing