چکیده

An essential part of validation of language proficiency tests has been examining test dimensionality. Various approaches are available to check test dimensionality. Possibly the most frequently applied methods of assessing test dimensionality are based on item response theory (IRT). One of the most fundamental assumptions of IRT is local item independence. That is, responses to a given item must be independent of responses to all other items. This requirement is not met in the case of reading comprehension tests. This study is conducted to examine the applicability of bifactor item response models to assessing test dimensionality. These models assume that there extra inter-item dependencies among the items after the effect of the main construct is partialled out. The data for the study came from administration of the university entrance exam in 2014. The analysis of the data using the Mplus software revealed that bifactor item response models show better fit compared to unidimensional item response models. The implications are discussed accordingly.

کليدواژه ها

Dimensionality, Item respondse Thoery, Bifactor item response modeling

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Hossein Karami , 1398 , Assessing the dimensionality of reading comprehension tests: A bifactor item response modeling approach , اولين کنفرانس بين المللي مطالعات زبان انگليسي