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Olenggius Jiran Dores

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Review Open access Aug 2026

Rasch-Based Diagnostic Instrument for Mathematical Abstraction in Linear Equations: Development and Initial Validation

Mathematical abstraction is a foundational cognitive competency for junior high school students, yet diagnostic instruments that map students’ positions along the Concrete–Representational–Abstract (CRA) continuum are still limited. This study developed and initially validated a Rasch-based diagnostic instrument for ma...

Beni Setiawan, Olenggius Jiran Dores · 0 citations

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