A Note on the Reliability Coefficients for Item Response Model-Based Ability Estimates

Autor/in	Kim, Seonghoon
Titel	A Note on the Reliability Coefficients for Item Response Model-Based Ability Estimates
Quelle	In: Psychometrika, 77 (2012) 1, S.153-162 (10 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0033-3123
DOI	10.1007/s11336-011-9238-0
Schlagwörter	Reliability; Item Response Theory; Tests; Correlation + Suchen Sie Ihr Suchwort? Reliabilität; Item-Response-Theorie; Examination; Prüfung; Examen; Korrelation
Abstract	Assuming item parameters on a test are known constants, the reliability coefficient for item response theory (IRT) ability estimates is defined for a population of examinees in two different ways: as (a) the product-moment correlation between ability estimates on two parallel forms of a test and (b) the squared correlation between the true abilities and estimates. Due to the bias of IRT ability estimates, the parallel-forms reliability coefficient is not generally equal to the squared-correlation reliability coefficient. It is shown algebraically that the parallel-forms reliability coefficient is expected to be greater than the squared-correlation reliability coefficient, but the difference would be negligible in a practical sense. (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10