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ERIC Number: EJ1111568
Record Type: Journal
Publication Date: 2007-Aug
Pages: 48
Abstractor: As Provided
ISSN: EISSN-2330-8516
Investigating the Effectiveness of a Synthetic Linking Function on Small Sample Equating. Research Report. ETS RR-07-37
Kim, Sooyeon; von Davier, Alina A.; Haberman, Shelby
ETS Research Report Series, Aug 2007
The synthetic function, which is a weighted average of the identity (the trivial linking function for forms that are known to be completely parallel) and a traditional equating method, has been proposed as an alternative for performing linking with very small samples (Kim, von Davier, & Haberman, 2006). The purpose of the present study was to investigate the benefits of the synthetic function using various real data sets gathered from different administrations of tests from a licensure testing program. We investigated the chained linear, Tucker, Levine, and mean equating methods, along with the identity and the synthetic functions with small samples (N = 19 to 70). Neither the identity nor the synthetic functions worked as well as did other linear equating methods, because test forms differed markedly in difficulty. The synthetic function cannot be used as a solution or methodological fix to a problem that is caused by poor data collection design. [Paper presented at the Annual Meeting of the National Council on Measurement in Education (NCME) (April 9-13, 2007, Chicago, IL).]
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Publication Type: Journal Articles; Reports - Research; Speeches/Meeting Papers
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A