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ERIC Number: EJ923895
Record Type: Journal
Publication Date: 2011-Jun
Pages: 21
Abstractor: As Provided
Reference Count: 32
ISBN: N/A
ISSN: ISSN-0146-6216
A Comparison of Four Methods of IRT Subscoring
de la Torre, Jimmy; Song, Hao; Hong, Yuan
Applied Psychological Measurement, v35 n4 p296-316 Jun 2011
Lack of sufficient reliability is the primary impediment for generating and reporting subtest scores. Several current methods of subscore estimation do so either by incorporating the correlational structure among the subtest abilities or by using the examinee's performance on the overall test. This article conducted a systematic comparison of four subscoring methods--multidimensional scoring (MS), augmented scoring (AS), higher order item response model scoring (HO), and objective performance index scoring (OPI)--by examining how test length, number of subtests or domains, and correlation between the abilities affect the subtest ability estimation. The correlation-based methods (i.e., MS, AS, and HO) provided largely similar results, and performed best under conditions involving multiple short subtests and highly correlated abilities. In most of the conditions considered, the OPI method performed poorer compared to other methods on both ability estimates and proportion correct scores. Real data analysis further underscores the similarities and differences between the four subscoring methods. (Contains 9 tables and 4 figures.)
SAGE Publications. 2455 Teller Road, Thousand Oaks, CA 91320. Tel: 800-818-7243; Tel: 805-499-9774; Fax: 800-583-2665; e-mail: journals@sagepub.com; Web site: http://sagepub.com
Publication Type: Journal Articles; Reports - Evaluative
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A