The Impact of Multidirectional Item Parameter Drift on IRT Scaling Coefficients and Proficiency Estimates

Autor/inn/en	Han, Kyung T.; Wells, Craig S.; Sireci, Stephen G.
Titel	The Impact of Multidirectional Item Parameter Drift on IRT Scaling Coefficients and Proficiency Estimates
Quelle	In: Applied Measurement in Education, 25 (2012) 2, S.97-117 (21 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0895-7347
DOI	10.1080/08957347.2012.660000
Schlagwörter	Item Response Theory; Test Items; Scaling; Methods; Scores; Achievement; Simulation + Suchen Sie Ihr Suchwort? Item-Response-Theorie; Test content; Testaufgabe; Scale construction; Skalenkonstruktion; Method; Methode; Performance; Leistung; Simulation program; Simulationsprogramm
Abstract	Item parameter drift (IPD) occurs when item parameter values change from their original value over time. IPD may pose a serious threat to the fairness and validity of test score interpretations, especially when the goal of the assessment is to measure growth or improvement. In this study, we examined the effect of multidirectional IPD (i.e., some items become harder while other items become easier) on the linking procedure and rescaled proficiency estimates. The impact of different combinations of linking items with various multidirectional IPD on the test equating procedure was investigated for three scaling methods (mean-mean, mean-sigma, and TCC method) via a series of simulation studies. It was observed that multidirectional IPD had a substantive effect on examinees' scores and achievement level classifications under some of the studied conditions. Choice of linking method had a direct effect on the results, as did the pattern of IPD. (Contains 3 tables, 4 figures, and 1 footnote.) (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10