Abstract:
The objective of this study is to identify and compare suitable forecasting models for predicting the amount of solid waste in Sai Mai District Office and Bang Kapi District Office. Additionally, the study aims to forecast the amount of solid waste in both districts. The data used in this study consists of two datasets: the amount of solid waste in Sai Mai District Office and the amount of solid waste in Bang Kapi District Office. Using secondary data on a monthly basis from January 2017 to December 2024, a total of 96 months, collected from the statistical records of the Environment Department in Bangkok. The study examines three individual forecasting methods: Exponential Smoothing Method Time Series Regression Method and Box-Jenkins Method Additionally, four combined forecasting techniques are analyzed: Simple Average Method or Equivalent Weighted (EW) Combined Forecasting Using Regression Analysis Inverse of Mean Square Error Method (IMSE) and Unequivalent Weighted Method (UNEW) The obtained forecasts are compared using different forecasting methods, with the selection criterion based on the Mean Absolute Percentage Error (MAPE). The method with the lowest MAPE is considered the most suitable model. The analysis results indicate that the combined forecasting using regression analysis is the most effective method, as it achieves the lowest MAPE.