SARI, N. N.; SUMARGO, B.; SIREGAR, D.; YULIANI, E.; SARI, C. K.; MAHARDIKA, B.; FADYA, K. S. CLASSIFICATION OF PRE-MARITAL SEX AMONG ADOLESCENTS USING COST-SENSITIVE WEIGHTED RANDOM FOREST ON IMBALANCED DATA. BAREKENG: Jurnal Ilmu Matematika dan Terapan, v. 20, n. 4, p. 2693-2710, 24 ago. 2026.