A Rasch-Based Validation of the Vocabulary Size Test

Autor/in	Beglar, David
Titel	A Rasch-Based Validation of the Vocabulary Size Test
Quelle	In: Language Testing, 27 (2010) 1, S.101-118 (18 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0265-5322
DOI	10.1177/0265532209340194
Schlagwörter	Test Items; Native Speakers; Test Validity; Vocabulary; Language Tests; English; Receptive Language; Guidelines; Goodness of Fit; Correlation; Japanese; Measurement; Graduate Students; Foreign Countries; Language Proficiency; Advanced Students; Second Language Instruction; English (Second Language); Language Teachers; Teacher Education; Construct Validity + Suchen Sie Ihr Suchwort? Test content; Testaufgabe; Muttersprachler; Testvalidität; Wortschatz; Language test; Sprachtest; English language; Englisch; Rezeptive Kommunikationsfähigkeit; Richtlinien; Korrelation; Japaner; Japanisch; Messverfahren; Graduate Study; Student; Students; Aufbaustudium; Graduiertenstudium; Hauptstudium; Studentin; Ausland; Language skill; Language skills; Sprachkompetenz; Fortgeschrittener; Fremdsprachenunterricht; English as second language; English; Second Language; Englisch als Zweitsprache; Language teacher; Sprachunterricht; Lehrerausbildung; Lehrerbildung
Abstract	The primary purpose of this study was to provide preliminary validity evidence for a 140-item form of the Vocabulary Size Test, which is designed to measure written receptive knowledge of the first 14,000 words of English. Nineteen native speakers of English and 178 native speakers of Japanese participated in the study. Analyses based on the Rasch model were focused on several aspects of Messick's validation framework. The findings indicated that (1) the items and examinees generally performed as predicted by "a priori" hypotheses, (2) the overwhelming majority of the items displayed good fit to the Rasch model, (3) the items displayed a high degree of unidimensionality with the Rasch model accounting for 85.6% of the variance, (4) the items showed a strong degree of measurement invariance with disattenuated Pearson correlations for person measures estimated with different sets of items of 0.91 and 0.96, and (5) various combinations of items provided precise measurement for this sample of examinees as indicated by Rasch reliability indices greater than 0.96. The Vocabulary Size Test provides teachers and researchers with a new instrument that greatly extends the range of measurement provided by other measures of written receptive vocabulary size. (Contains 2 tables and 3 figures.) (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10