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All Journal Jurnal Gantang PEDAGOGIA JISAE (Journal of Indonesian Student Assesment and Evaluation) JRAMathEdu (Journal of Research and Advances in Mathematics Education)
Ocy, Dwi Rismi
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Education Mathematics

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Maximizing Learning Outcomes: A Comparative Analysis of IRT- and CTT- Differentiated Learning based Design Ocy, Dwi Rismi; Tjalla, Awaluddin; Soeprijanto, Soeprijanto
PEDAGOGIA Vol 22, No 3 (2024)
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/pdgia.v22i3.77064

Abstract

Addressing diverse student abilities remains a persistent challenge in education, particularly in complex subjects such as linear equations and inequalities. This study compared the effectiveness of Item Response Theory (IRT)-based and Classical Test Theory (CTT)-based differentiated learning designs in improving student performance in these topics. Conducted in two secondary schools, the research involved 126 students, with 61 students assigned to the IRT group and 65 to the CTT group. Using a quasi-experimental pretest-posttest control group design, the study evaluated the impact of both approaches on learning outcomes. The results revealed significant performance improvements in both groups. However, the IRT-based approach, which tailored tasks to individual ability levels, produced a significantly higher average posttest score and a larger effect size compared to the CTT-based approach. These findings underscore the precision and effectiveness of IRT in differentiating instruction to meet diverse learner needs, particularly in challenging subjects. The study concludes that adopting IRT-based strategies can enhance educational practices and optimize student learning outcomes, offering a robust alternative for addressing variability in student abilities.
Developing a Validated Essay-Based Assessment Instrument to Measure Science Literacy in Energy Topics Sheptian, Riky; Ocy, Dwi Rismi; Triana, Dinny Devi; Wahyuni, Lussy Dwi Utami
JISAE: Journal of Indonesian Student Assessment and Evaluation Vol. 10 No. 2 (2024): JISAE: Journal of Indonesian Student Assessment and Evaluation
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jisae.v10i2.50762

Abstract

Science literacy is a critical skill in the 21st century, particularly for middle school students navigating the complexities of energy concepts in science education. This study aims to develop and validate an essay-based assessment instrument designed to measure students' science literacy skills in the context of energy. Employing a mixed-methods approach, the research involved expert validation, panel validation, and empirical testing with 111 students from junior high school in Sukabumi, Indonesia. The results revealed that the instrument possesses strong content validity, with Aiken's V, CVR, and I-CVI scores exceeding 0.80. Construct validity analysis using Exploratory Factor Analysis (EFA) confirmed the suitability of the factor structure, while reliability tests yielded McDonald’s ω = 0.886 and Cronbach's α = 0.922, indicating excellent internal consistency. The instrument also includes a detailed analytical rubric to ensure objective and transparent evaluation. This validated tool offers educators a reliable means of assessing students' science literacy comprehensively, addressing a critical gap in science education evaluation. By fostering more effective assessment practices, this study contributes to enhancing the quality of science education in Indonesia and beyond.
EFA and CFA analysis: Development and validation of a test instrument for mathematical abstraction skills Ocy, Dwi Rismi; Sarifah, Iva; Riyadi, Riyadi
JRAMathEdu (Journal of Research and Advances in Mathematics Education) Volume 10 Issue 2 April 2025
Publisher : Lembaga Pengembangan Publikasi Ilmiah dan Buku Ajar, Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/jramathedu.v10i2.7601

Abstract

Mathematical abstraction skills are fundamental for advanced reasoning and problem-solving; however, assessing these skills in senior high school students poses challenges due to the limited availability of validated instruments. This study aims to develop and validate a test instrument for measuring mathematical abstraction skills in Indonesian high school students. The instrument targets three hierarchical cognitive levels: perceptual abstraction, internalization, and interiorization. A quantitative approach was used, involving Exploratory and Confirmatory Factor Analysis (EFA and CFA) to establish construct validity. Content validity was first evaluated by 17 mathematics educators using Aiken’s V index, followed by expert judgment from five specialists. A field test with 507 students provided the dataset for analysis. Findings from EFA and CFA confirmed that the instrument exhibited strong construct validity and reliability, with clear alignment between items and the targeted abstraction levels. The internal consistency metrics demonstrated the instrument’s ability to reliably assess mathematical abstraction across cognitive hierarchies. This validated tool contributes to mathematics education by providing a reliable means for assessing abstraction skills, facilitating improvements in instructional strategies and student evaluations. Its potential applications extend to educational research and classroom assessments, offering educators insights into students’ reasoning processes to support deeper learning outcomes. 
Rasch model analysis: Evaluating students' spatial thinking ability in higher-order thinking skills trigonometric comparison assessment (HOTS-TCA) Ocy, Dwi Rismi; Rahayu, Wardani; Arthur, Riyan
Jurnal Gantang Vol 9 No 2 (2024): Jurnal Gantang
Publisher : Universitas Maritim Raja Ali Haji

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31629/jg.v9i2.6949

Abstract

This study addresses the critical issue of insufficient spatial thinking abilities among students, which significantly affects their performance in higher-order thinking skills (HOTS) tasks, particularly in trigonometry. Focusing on 11th-grade students in Tanjungpinang, Indonesia, the research investigates how spatial thinking influences the ability to solve trigonometric comparison problems. Employing a mixed-method approach, the study integrates quantitative data from the Higher-Order Thinking Skills in Trigonometric Comparisons Assessment (HOTS-TCA) with qualitative insights from post-test interviews. Rasch Model Analysis evaluates the quality of an assessment instrument by providing measures of respondent abilities and item difficulties, fit statistics to ensure model alignment, reliability, and separation indices for consistency, a Wright Map for visualizing the relationship between skills and difficulties, and checks for unidimensionality and potential item bias to ensure fairness and validity. The Rasch analysis further confirms the reliability and validity of the HOTS-TCA instrument, highlighting its effectiveness in measuring spatial thinking across varying ability levels. The study finds that students with high spatial ability excel in visualizing geometric relationships but struggle with complex three-dimensional tasks. In contrast, medium-ability students have difficulties with mental manipulation and real-world applications, and low-ability students face significant challenges in basic visualization and interpreting geometric structures, leading to frequent misconceptions.
Co-Authors Adi Soeprijanto Awaluddin Tjalla Dinny Devi Triana Iva Sarifah Nurwijayanti Riyan Arthur Sheptian, Riky Wahyuni, Lussy Dwi Utami Wardani Rahayu