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ERIC Number: ED423240
Record Type: Non-Journal
Publication Date: 1998
Pages: 35
Abstractor: N/A
Reference Count: N/A
Application of Direct Optimization for Item Calibration in Computerized Adaptive Testing.
Krass, Iosif A.
In the process of item calibration for a computerized adaptive test (CAT), many well-established calibrating packages show weakness in the estimation of item parameters. This paper introduces an on-line calibration algorithm based on the convexity of likelihood functions. This package consists of: (1) an algorithm that estimates examinee ability and (2) an algorithm that estimates the parameters for a new item that is seeded into the CAT test. The performance of the new package is comparable to BilogMG, and in some cases exceeds it. The new algorithm belongs to the class of Direct Maximization Aposteriori algorithms. (Contains 9 figures, 2 tables, and 17 references.) (Author/SLD)
Publication Type: Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A