Decomposition and Holt-Winters enhanced by the Whale Optimization Algorithm

This script implements a decomposition-based forecasting model for monthly dam reservoir inflow data, enhanced by the Whale Optimization Algorithm (WOA) to optimize trend and seasonal parameters. It splits data into training and testing sets, fits an additive or multiplicative model, runs WOA for parameter tuning, and outputs fitted/in-sample, forecast/out-of-sample values, as well as evaluation metrics (RMSE, MAE, MAPE, sMAPE). Cite this article: Minsan, W., & Minsan, P. (2024). Decomposition and holt-winters enhanced by the whale optimization algorithm for forecasting the amount of water inflow into the large dam reservoirs in southern thailand. Journal of Current Science and Technology, 14(2), Article 38https://doi.org/10.59796/jcst.V14N2.2024.38