extended · article · 2018

Using the Rasch model to analyze the test of understanding of vectors

Ana Sušac; Maja Planinić; Damjan Klemencic; Željka Milin Šipuš; John M. Linacre

The test of understanding of vectors (TUV) is a multiple-choice test that was recently developed to assess student understanding of vector concepts required in introductory physics courses at the university level. In this study, the TUV was administered to 889 first-year students at the University of Zagreb. The Rasch model was used to evaluate the functioning of the TUV, and to determine the difficulty scale of vector concepts evaluated by this assessment instrument. The results of the Rasch analysis showed a good functioning of test items. However, the TUV was not well targeted to our sample of first-year engineering and science students in introductory physics courses. About half of the students had abilities outside the range of item difficulties, indicating that the TUV would benefit from including more difficult items that would help to better estimate the abilities of these studen...