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ERIC Number: EJ1110992
Record Type: Journal
Publication Date: 2009-Dec
Pages: 32
Abstractor: As Provided
ISSN: EISSN-2330-8516
Comparison of the Effects of Discrete Anchor Items and Assage-Based Anchor Items on Observed-Score Equating Results. Research Report. ETS RR-09-44
Zu, Jiyun; Liu, Jinghua
ETS Research Report Series, Dec 2009
Equating of tests composed of both discrete and passage-based items using the nonequivalent groups with anchor test (NEAT) design is popular in practice. This study investigated the impact of discrete anchor items and passage-based anchor items on observed score equating via simulation. Results suggested that an anchor with a larger proportion of passage-based items and/or a larger degree of local dependence among passage-based items produces larger equating errors, especially when group ability differences are not minimal. Our findings challenge the common belief that an anchor should be a miniature version of the tests to be equated.
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A