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ERIC Number: ED523782
Record Type: Non-Journal
Publication Date: 2010-Nov
Pages: 41
Abstractor: As Provided
The Use of Two Anchors in Nonequivalent Groups with Anchor Test (NEAT) Equating. Research Report. ETS RR-10-23
Moses, Tim; Deng, Weiling; Zhang, Yu-Li
Educational Testing Service
In the equating literature, a recurring concern is that equating functions that utilize a single anchor to account for examinee groups' nonequivalence are biased when the groups are extremely different and/or when the anchor only weakly measures what the tests measure. Several proposals have been made to address this equating bias by incorporating more than one anchor into nonequivalent groups with anchor test (NEAT) equating functions. These proposals have not been extensively considered or comparatively evaluated. This study evaluates three methods for incorporating more than one anchor into NEAT equating functions, including poststratification, imputation, and propensity score matching. The three methods are studied and compared in two examples. The implications for using the three equating approaches in practice and for developing alternative strategies to incorporate two anchors are discussed. (Contains 19 figures, 8 tables and 3 notes.)
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Publication Type: Numerical/Quantitative Data; Reports - Evaluative
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: Educational Testing Service