An Integrated Multidimensional Item Response Theory Validation Framework for a Chemistry Achievement Test

Authors

DOI:

https://doi.org/10.71291/rwykgq70

Keywords:

Chemistry Achievement Assessment, DETECT Method, Differential Item Functioning, Measurement Invariance, Multidimensional Item Response Theory

Abstract

The validity of chemistry achievement assessments remains a concern due to the multidimensional nature of the construct and the continued reliance on fragmented validation approaches. This study addresses this gap by adopting an integrated psychometric validation framework grounded in multidimensional Item Response Theory (MIRT). A 150-item dichotomously scored Chemistry Achievement Test (CAT) was administered to 741 senior secondary school students. Dimensionality was examined using Stout’s DETECT procedure, revealing weak multidimensionality characterised by a dominant general factor and three secondary dimensions, thereby supporting a four-dimensional structure. Competing MIRT models (M1PL, M2PL, M3PL, and M4PL) were evaluated using likelihood-ratio tests and information criteria. The multidimensional three-parameter logistic (M3PL) model demonstrated superior fit and parsimony, underscoring the importance of modelling both item discrimination and guessing in multiple-choice contexts. Local item independence, assessed via Yen’s Q3 statistic, showed no evidence of problematic residual correlations. Item parameter screening indicated that 84% of items met established criteria, leading to the removal of poorly functioning items. Measurement invariance was evaluated through IRT likelihood-ratio Differential Item Functioning (DIF) analysis across sex and school type, resulting in a final set of 112 invariant items. The findings provide strong evidence for the structural validity, reliability, and fairness of the CAT. Beyond its empirical contribution, the study advances an integrated validation framework that systematically combines dimensionality assessment, model evaluation, local independence diagnostics, and invariance testing, offering a robust template for developing equitable and psychometrically sound science assessments.

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Published

2026-09-08

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Section

Computer Adaptive Testing Research

How to Cite

Abayomi, F. R., & Osokoya, M. M. (2026). An Integrated Multidimensional Item Response Theory Validation Framework for a Chemistry Achievement Test. Journal of Computer Adaptive Testing in Africa, 5, 82-115. https://doi.org/10.71291/rwykgq70