Akpinar, Cihat TalatKosar, OzcanDurdu, Akif2025-06-112025-06-112025979833151580597983315157992767-9454https://doi.org/10.1109/INFOTEH64129.2025.10959301This study aims to compare and improve the performance of four different machine learning algorithms (Naive Bayes, Multi-Layer Perceptron (MLP), Decision Trees, and Support Vector Machines (SVM)) in classification problems. The analyses emphasize the impact of data preprocessing steps and hyperparameter optimization on model performance. As part of the data preprocessing, missing values were imputed, categorical data were transformed into numerical data, and normalization procedures were applied. It was observed that normalization significantly enhanced the performance of the MLP and SVM algorithms in particular. Furthermore, additional improvements in accuracy rates were achieved through hyperparameter optimization. Naive Bayes and Decision Trees were found to exhibit stable performance regardless of data scaling. This study demonstrates that proper data preprocessing and model selection can significantly enhance algorithm performance in classification problems.eninfo:eu-repo/semantics/closedAccessDecision TreesMachine LearningMLPNaive BayesSVMConference Object10.1109/INFOTEH64129.2025.109593012-s2.0-105004340983