Estimating Testing Time Extension Ratios for Students with Disabilities from Item Cumulative Curves

Abstract

Summary. This study was conducted to define item cumulative score ratio curves and item cumulative completion ratio curves and to propose a new method to estimate fair extension ratios of testing time for students with disabilities from these curves. The proposed method estimates extension ratios of testing time of regular tests under the time-limit method from experimentally collected test data utilizing the work-limit method. In this experiment we found that for students with visual disabilities, the present extension ratio of testing time at the National Center Test for University Admissions in Japan is fair in Mathematics and English and that in order to improve the present testing method of the National Center Test, further extension of testing time is necessary for some subjects with a large amount of reading questions, such as Japanese.