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All Journal Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal)
Mohd Khairul Nizam Syah
Universitas Pendidikan Indonesia
Agriculture, Biological Sciences & Forestry Chemistry Education Physics

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Analisis Kualitas Instrumen Pemahaman Konsep pada Materi Energi Terbarukan Menggunakan Model Rasch Rapi Alwi Azhar; Parlindungan Sinaga; Agus Danawan; Lina Aviyanti; Mohd Khairul Nizam Syah
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 3 (2026): August (Inpres)
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i3.2451

Abstract

This study aimed to analyze the quality of a conceptual understanding test instrument on renewable energy using the Rasch measurement model. The instrument consisted of 19 multiple-choice items developed based on the conceptual understanding dimensions proposed by Anderson and Krathwohl (2001) and was administered to 75 tenth-grade senior high school students. Data were analyzed using MINISTEP version 5.10.3.0, including content validity (Aiken’s V coefficient), construct validity (unidimensionality, outfit MNSQ, ZSTD, and Point Measure Correlation), reliability, item difficulty, Differential Item Functioning (DIF), and the Wright Map. The results showed that 14 of the 19 items were content valid (V ≥ 0.80). The raw variance explained by measures was 36.5%, indicating that the instrument satisfied the unidimensionality assumption. The analysis also revealed a person reliability of 0.71 (acceptable), an item reliability of 0.94 (very good), and a Cronbach’s alpha (KR-20) of 0.77 (very good). Three items (S7, S10, and S19) exhibited significant Differential Item Functioning (DIF) based on gender. The Wright Map indicated that the mean student ability was 1.14 logits, while item difficulty ranged from −2.15 to 3.33 logits. Overall, the instrument was considered suitable for measuring students’ conceptual understanding of renewable energy after revisions were made to the problematic items.
Analysis of Instrument Quality for Measuring High School Students’ Conceptual Understanding of Global Warming Mohd Khairul Nizam Syah; Parlindungan Sinaga; Dedi Sasmita; Lina Aviyanti; Rapi Alwi Azhar
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 3 (2026): August (Inpres)
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i3.2453

Abstract

Conceptual understanding of global warming is essential for enabling students to explain environmental phenomena scientifically and apply physics concepts to real-world issues; therefore, a valid and reliable assessment instrument is needed. This study aimed to analyze the quality of a test instrument measuring high school students' conceptual understanding of global warming using the Rasch Model. A descriptive quantitative approach was employed involving 43 eleventh-grade students from a public high school in Bandung selected through purposive sampling. The instrument consisted of 20 multiple-choice items based on the Revised Bloom's Taxonomy at the C2 level. Data were analyzed using MINISTEP. The results showed that the instrument satisfied the unidimensionality assumption, with 50.9% raw variance explained by measures and 6.7% unexplained variance in the first contrast. Item fit analysis identified 9 highly suitable items, 7 suitable items, 1 less suitable item, and 3 unsuitable items. Reliability analysis yielded person reliability of 0.63, item reliability of 0.93, and Cronbach's alpha of 0.71. Therefore, the instrument is generally suitable for measuring students' conceptual understanding of global warming, although several items require revision
Co-Authors Danawan, Agus Lina Aviyanti Parlindungan Sinaga Rapi Alwi Azhar Sasmita, Dedi