Comparisons among Small Sample Equating Methods in a Common-Item Design

Autor/inn/en	Kim, Sooyeon; Livingston, Samuel A.
Titel	Comparisons among Small Sample Equating Methods in a Common-Item Design
Quelle	In: Journal of Educational Measurement, 47 (2010) 3, S.286-298 (13 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0022-0655
DOI	10.1111/j.1745-3984.2010.00114.x
Schlagwörter	Equated Scores; Test Items; Item Sampling; Item Response Theory; Criterion Referenced Tests; Measurement Techniques + Suchen Sie Ihr Suchwort? Test content; Testaufgabe; Item-Response-Theorie; Messtechnik
Abstract	Score equating based on small samples of examinees is often inaccurate for the examinee populations. We conducted a series of resampling studies to investigate the accuracy of five methods of equating in a common-item design. The methods were chained equipercentile equating of smoothed distributions, chained linear equating, chained mean equating, the symmetric circle-arc method, and the simplified circle-arc method. Four operational test forms, each containing at least 110 items, were used for the equating, with new-form samples of 100, 50, 25, and 10 examinees and reference-form samples three times as large. Accuracy was described in terms of the root-mean-squared difference (over 1,000 replications) of the sample equatings from the criterion equating. Overall, chained mean equating produced the most accurate results for low scores, but the two circle-arc methods produced the most accurate results, particularly in the upper half of the score distribution. The difference in equating accuracy between the two circle-arc methods was negligible. (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10