A Note on the Choice of an Anchor Test in Equating. Research Report. ETS RR-12-14

Autor/inn/en	Sandip, Sinharay; Haberman, Shelby; Holland, Paul; Lewis, Charles
Titel	A Note on the Choice of an Anchor Test in Equating. Research Report. ETS RR-12-14
Quelle	In: ETS Research Report Series, (2012), (15 Seiten)Infoseite zur Zeitschrift PDF als Volltext kostenfreie Datei Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	2330-8516
Schlagwörter	Equated Scores; Test Items; Correlation; Item Response Theory; Difficulty Level + Suchen Sie Ihr Suchwort? Test content; Testaufgabe; Korrelation; Item-Response-Theorie; Schwierigkeitsgrad
Abstract	Anchor tests play a key role in test score equating. We attempt to find, through theoretical derivations, an anchor test with optimal item characteristics. The correlation between the scores on a total test and on an anchor test is maximized with respect to the item parameters for data satisfying several item response theory models. Results suggest that under these models, the "minitest," the traditionally used anchor test, is not optimal with respect to anchor-test-to-total-test correlation; instead, an anchor test with items of medium difficulty, the "miditest," seems to be the optimum anchor test. This finding agrees with the empirical findings of Sinharay and colleagues that the miditest mostly has higher anchor-test-to-total-test correlation compared to the minitest and mostly performs as well as the minitest in equating. (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2020/1/01