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CTest Construct Validation: A Rasch Modeling Approach,Used
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CTest is an economical test of general language proficiency in the first and second language. Ease of construction and scoring coupled with its cost effectiveness have made CTest a useful instrument for institutions which need a quick placement instrument and second language researchers who need a measure of learners' general language proficiency. The present book addresses CTest construct validity by using the latest developments in modern measurement theory. Probing into the dimensionality of CTest is the main focus of the book. Rasch modeling is used to study different aspects of C Test construct and to clarify the dimensionality issue. In this endeavor exploratory factor analysis, Rasch rating scale model, differential person and item functioning (DIF/DPF), principle component analysis of residuals (PCAR) and item and person measures invariance are used. The results should help CTest users make informed decisions when embarking on using CTest for their next testing project. It should also be useful to language testing researchers who want to investigate some ripe areas of research in CTest.
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