Rasch Scale Stability in the Presence of Item Parameter and Trait Drift

Autor/inn/en	Babcock, Ben; Albano, Anthony D.
Titel	Rasch Scale Stability in the Presence of Item Parameter and Trait Drift
Quelle	In: Applied Psychological Measurement, 36 (2012) 7, S.565-580 (16 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0146-6216
DOI	10.1177/0146621612455090
Schlagwörter	Test Items; Measurement; Item Response Theory; Predictor Variables; Effect Size; Statistical Analysis; Classification; Accuracy + Suchen Sie Ihr Suchwort? Test content; Testaufgabe; Messverfahren; Item-Response-Theorie; Prädiktor; Statistische Analyse; Classification system; Klassifikation; Klassifikationssystem
Abstract	Testing programs often rely on common-item equating to maintain a single measurement scale across multiple test administrations and multiple years. Changes over time, in the item parameters and the latent trait underlying the scale, can lead to inaccurate score comparisons and misclassifications of examinees. This study examined how instability in a scale and the items composing a scale affects item parameter recovery and classification accuracy. Results showed that a Rasch item response theory scale can maintain near baseline recovery properties if the changes in the latent trait over time are small. The Rasch scale also maintained good recovery of item and person parameters if there was equal item drift in both directions. Under conditions of relatively little item drift and small to moderate periodic changes in the latent trait, a Rasch scale may remain stable for 15 years, [plus or minus]3. Substantial item drift or large changes in the latent trait can dramatically reduce the longevity of the scale. (Contains 6 tables and 6 figures.) (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10