ERIC Number: ED427042
Record Type: Non-Journal
Publication Date: 1998-Dec
Reference Count: N/A
Simulating Nonmodel-Fitting Responses in a CAT Environment. ACT Research Report Series 98-10.
Yi, Qing; Nering, Michael L.
This study developed a model to simulate nonmodel-fitting responses in a computerized adaptive testing (CAT) environment, and to examine the effectiveness of the model. The underlying idea was to simulate examinees' test behaviors realistically. This study simulated a situation in which examinees are exposed to or are coached on test items before actual testing. The multidimensional item response theory (MIRT) (M. Reckase, 1985) model was adopted for this study. Test characteristic curves and the proportion of affected items administered to examinees were investigated. The results indicate that the probability of an examinee responding to an item correctly and the proportion of affected items administered to examinees were influenced by the severity and the number of affected items. The results also suggest that the proposed model might be an effective tool for investigating the issue of nonmodel-fitting responses in a CAT environment. (Contains 7 figures and 39 references.) (Author/SLD)
Descriptors: Adaptive Testing, Computer Assisted Testing, Goodness of Fit, Item Response Theory, Models, Responses, Simulation, Test Coaching
ACT Research Report Series, P.O. Box 168, Iowa City, IA 52243-0168.
Publication Type: Reports - Research
Education Level: N/A
Authoring Institution: ACT, Inc., Iowa City, IA.