A Comparison of Adjacent Categories and Cumulative Differential Step Functioning Effect Estimators

Autor/inn/en	Gattamorta, Karina A.; Penfield, Randall D.
Titel	A Comparison of Adjacent Categories and Cumulative Differential Step Functioning Effect Estimators
Quelle	In: Applied Measurement in Education, 25 (2012) 2, S.142-161 (20 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0895-7347
DOI	10.1080/08957347.2012.660387
Schlagwörter	Measurement; Item Response Theory; Test Bias; Test Items; Comparative Analysis; English Language Learners; Performance Based Assessment; Grade 5; Grade 8; Science Tests + Suchen Sie Ihr Suchwort? Messverfahren; Item-Response-Theorie; Testkritik; Test content; Testaufgabe; Leistungsermittlung; School year 05; 5. Schuljahr; Schuljahr 05; School year 08; 8. Schuljahr; Schuljahr 08
Abstract	The study of measurement invariance in polytomous items that targets individual score levels is known as differential step functioning (DSF). The analysis of DSF requires the creation of a set of dichotomizations of the item response variable. There are two primary approaches for creating the set of dichotomizations to conduct a DSF analysis: the adjacent categories approach, and the cumulative approach. To date, there is limited research on how these two approaches compare within the context of DSF, particularly as applied to a real data set. This study evaluated the results of a DSF analysis using both dichotomization schemes in order to determine if the two approaches yield similar results. The results revealed that the two approaches generally led to consistent results, particularly in the case where DSF effects were negligible. However, when significant DSF effects were present, the two approaches occasionally led to differing conclusions. (Contains 5 tables and 1 figure.) (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10