Funcion, D.G.D. and Natividad, M.C.B. 2026. Nonlinear Prediction with Data Augmentation and Regularization: A Ensembled LSTM–XGBoost Model. Scientific Journal of Engineering Research. 2, 3 (Apr. 2026), 284–295. DOI:https://doi.org/10.64539/sjer.v2i3.2026.478.