Damar Sakti, M.L., Jailani, J., Retnawati, H., Hidayati, K., Waryanto, N.H., Ibrahim, Z.S., Khoirunnisa, A., Satiranandi Wibowo, F.A., Berlian, M.O. and Batubara, A.A. 2025. THE EFFECT OF SAMPLE SIZE ON THE STABILITY OF XGBOOST MODEL PERFORMANCE IN PREDICTING STUDENT STUDY PERIOD. BAREKENG: Jurnal Ilmu Matematika dan Terapan. 19, 4 (Sep. 2025), 2679-2692. DOI:https://doi.org/10.30598/barekengvol19iss4pp2679-2692.