inrep: A Comprehensive Framework for Adaptive Testing in R

Abstract: The inrep package provides a comprehensive framework for implementing computerized adaptive testing (CAT) in R. Building upon established psychometric foundations from TAM, the package enables researchers to deploy production-ready adaptive assessments through an integrated shiny interface. The framework supports all major item response theory models (1PL, 2PL, 3PL, GRM) with real-time ability estimation, multiple item selection algorithms, and sophisticated stopping criteria. Key innovations include dual estimation engines for optimal speed-accuracy balance, comprehensive multilingual support, GDPR-compliant data management, and seamless integration with external platforms. Empirical validation demonstrates measurement accuracy within established benchmarks while reducing test length efficiently. The package addresses critical barriers to CAT adoption by providing a complete solution from study configuration through deployment and analysis, making adaptive testing accessible to researchers across educational, psychological, and clinical domains.