RT Journal Article T1 Feature selection using a classification error impurity algorithm and an adaptive genetic algorithm improved with an external repository A1 Nematzadeh, Hossein A1 García-Nieto, José Manuel A1 Navas-Delgado, Ismael A1 Aldana-Montes, José Francisco K1 Algoritmos genéticos K1 Programación genética (Informática) K1 Sistemas expertos K1 Ingeniería del software AB Feature selection in small-sample high-dimensional datasets enhances classification accuracy and reduces computational time for model training. This paper introduces the filter Classification Error Impurity (CEI) as a frequency-based ranker that improves upon existing methods by better identifying non-linear patterns. According to this, the top features identified by the ensemble of CEI, along with Mutual Information (MI) and Fisher Ratio (FR), form the feature space utilized by the Adaptive Genetic Algorithm with External Repository (AGAwER) to identify the optimal feature combination in a wrapper approach. AGAwER leverages an external repository, incorporating the best solutions to enrich the Genetic Algorithm’s (GA) population, thus promoting diversity and enhancing exploration. As a result, a hybrid method called CMF-AGAwER is proposed, which surpasses existing modern feature selection methods. The implementation and data are accessible on GitHub at https://github.com/KhaosResearch/CMF-AGAwER. PB Elsevier YR 2024 FD 2024 LK https://hdl.handle.net/10630/32475 UL https://hdl.handle.net/10630/32475 LA eng NO Hossein Nematzadeh, José García-Nieto, Ismael Navas-Delgado, José F. Aldana-Montes, Feature selection using a classification error impurity algorithm and an adaptive genetic algorithm improved with an external repository, Knowledge-Based Systems, Volume 301, 2024, 112345, ISSN 0950-7051, https://doi.org/10.1016/j.knosys.2024.112345 NO Funding for open access charge: Universidad de Málaga / CBUA. This work has been partially funded by grants (funded by MCIN/AEI/10.13039/501100011033/) PID2020-112540RB-C41, AETHER-UMA(A smart data holistic approach for context-aware data analytics: semantics and context exploitation), and QUAL21 010UMA (Junta de Andalucía). DS RIUMA. Repositorio Institucional de la Universidad de Málaga RD 19 ene 2026