Heuristic Assembly of a Classification Multistage Test with Testlets
In addition to the advantages of shortening test and balancing item bank usage, multistage testing (MST) has its unique merit of incorporating testlets. Testlet refers to a group of items sharing the same piece of stimulus. As MST can include an entire testlet in one module, fewer stimuli are required than items. On the other hand, computerized adaptive testing (CAT) selects item one by one, thus excludes the possibility of several items sharing the same stimulus. In this way, testlets in MST save the stimuli processing time and facilitate ability estimate. In order to utilize the advantages brings by testlet, a classification MST was designed to upgrade an operational listening test. A heuristic module top-down assembly procedure incorporating testlet was developed based on the modified normalized weighted absolute deviation heuristic (NWADH). A three-stage classification MST with 1-3-5 panel design was assembled to classify examinees into six levels. A real data-based simulation study was conducted to compare the performance of the classification MST and the operational linear test in terms of ability recovery and classification accuracy. The bi-factor model was used in item parameter calibration and examinee scoring. Results show the 30-item MST had a similar performance as the 44-item linear test with prior knowledge of examinee ability and outperformed the 44-item linear test without prior information, in both ability recovery and classification accuracy. In conclusion, the classification MST can shorten the test while keeping a good accuracy.
KeywordsMultistage testing Classification Testlets
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