The Assessment of Reliability Under Range Restriction: A Comparison of [Alpha], [Omega], and Test-Retest Reliability for Dichotomous Data

Autor/inn/en	Fife, Dustin A.; Mendoza, Jorge L.; Terry, Robert
Titel	The Assessment of Reliability Under Range Restriction: A Comparison of [Alpha], [Omega], and Test-Retest Reliability for Dichotomous Data
Quelle	In: Educational and Psychological Measurement, 72 (2012) 5, S.862-888 (27 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0013-1644
DOI	10.1177/0013164411430225
Schlagwörter	Reliability; Computation; Comparative Analysis; Item Response Theory; Correlation; Robustness (Statistics); Statistical Bias; Sample Size; Error of Measurement + Suchen Sie Ihr Suchwort? Reliabilität; Item-Response-Theorie; Korrelation; Widerstandsfähigkeit; Messfehler
Abstract	Though much research and attention has been directed at assessing the correlation coefficient under range restriction, the assessment of reliability under range restriction has been largely ignored. This article uses item response theory to simulate dichotomous item-level data to assess the robustness of KR-20 ([alpha]), [omega], and test-retest under varying selection ratios. These estimators, both corrected and uncorrected for range restriction, were compared in terms of both bias and precision. Test-retest reliability was usually the best estimator of reliability across a variety of conditions. Only under indirect range restriction did KR-20 and [omega] performed well. All estimators suffered imprecision as a function of range restriction, above and beyond the reduction in sample size. Based on the results, a set of recommendations are proposed. (Contains 7 tables and 6 figures.) (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10