Document Type : Research Paper


1 English Department, Faculty of Foreign Languages, University of Isfahan, Iran

2 English Department, Faculty of Foreign Languages, University of Isfahan,Iran

3 English Department, Faculty of Foreign Languages,University of Isfahan, Iran



The current study attempts to fill the gap by utilizing a two-parameter item response model to investigate the psychometric properties (item difficulty and item discrimination) of the MSRT test. The Test Information Function (TIF) was also figured out to estimate how well the test at what range of ability distinguishes respondents. To this end, 328 graduate students (39.9% men and 60.1% women) who were selected randomly from three universities in Isfahan. A version of MSRT English proficiency test was administered to the participants at three universities in Isfahan. The results showed that all four sub-sets of MSRT test met the unidimensionality assumption. Analysis of difficulty and discrimination indices of total test revealed 14% test items were either easy or very easy, 38% were medium, and 48% were either difficult or very difficult. In addition, 14% of the total items were classified as nonfunctioning. They discriminated negatively or did not discriminate at all. 7% total items discriminated poorly, 17% discriminated moderately, and 62% discriminated either highly or perfectly, however they differentiated between high-ability and higher-ability test takers. Thus, 38% of the items displayed satisfactory difficulty. Too easy (14%) and too difficult (48%) items could be one potential reason why some items have low discriminating power. An auxiliary inspection of items by the MSRT test developers is indispensable.


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