Improving Algorithm Accuracy K-Nearest Neighbor Using Z-Score Normalization and Particle Swarm Optimization to Predict Customer Churn. J. Soft Comput. Explor. [Internet]. 06 oktober 2020 [citerad 26 augusti 2026];1(1):56-62. Tillgänglig vid: https://shmpublisher.com/index.php/joscex/article/view/7