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All Journal AL ISHLAH Jurnal Pendidikan
Jumini Jumini
Yogyakarta State University
Education Languange, Linguistic, Communication & Media Mathematics Other

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Estimating Item Parameters and Student Abilities: An IRT 2PL Analysis of Mathematics Examination Jumini Jumini; Heri Retnawati
AL-ISHLAH: Jurnal Pendidikan Vol 14, No 1 (2022): AL-ISHLAH: Jurnal Pendidikan
Publisher : STAI Hubbulwathan Duri

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (629.063 KB) | DOI: 10.35445/alishlah.v14i1.926

Abstract

This research aims to describe the characteristics of math test instruments are tested on 373 of 10th-grade vocational high school students and to describe student abilities. The analysis was conducted using the Item Response Theory (IRT) approach with the  2 Parameter Logistic  (2PL) model. The whole analysis process was conducted with the help of the R Program, SPSS and Excel. This finding shows that 2 items did not fit the 2 PL model. Of the 28 items that fit the 2PL model, 3 do not have a good discriminating index because they have negative values. Of 30 items that were tested, 3 items were very easy, 21 items were moderate, one item was difficult, and five items were very difficult. Student abilities ranged between -4.69 logit and 4.09 logit with an average of 0.05 logit. Based on the category, the proportion of students with moderate ability reached 63.54%, high ability 15.28%, very high ability 1.34%, while students with low ability were 19.57%, and very low ability was only 0.27%.  The maximum information function of this test was 29,37 (has good category) on the ability (θ) of -0,8 logit and SEM of 0.18 logit. Overall, the test was suitable for students with abilities between -2,6 and 2,4 logit. Based on these results, 25 items can be included in the question bank with suggestions for improvement in the proportion of difficulty level to reach a normal curve balance.
Co-Authors Heri Retnawati