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In this research, a hybrid model of ARIMA and SVM is developed and proposed for PM10 forecasting in Na Phra Lan sub-district, Chaloem Phra Kiat district, Saraburi province based on an assumption of additive components. In this regard, the ARIMA model, which has dominated in linear forecasting problems, is used to predict linear components of the PM10 time series. Whilst, the SVM model is a well-known approach with superior performance of nonlinear forecasting model, which is used to formulate nonlinear and complex function in order to predict nonlinear components of the PM10 time series. In addition, the developed model is compared to both ARIMA model and SVM model based on six accuracy measures. The empirical results revealed that the SVM model based on radial kernel function slightly outperforms ARIMA model. In contrast, the developed hybrid model can provide lower errors than both ARIMA and SVM models. The comparison between ARIMA model and SVM model indicated that the PM10 time series may not be explicit linear or nonlinear patterns. Subsequently, the developed hybrid model can reduce a risk of using improper forecasting model. Consequently, the hybrid ARIMA-SVM model can be a promising tool for PM10 forecasting in other area in order to provide useful information to monitor and make a critical decision on air quality that is not only a very challenging task but also a public concerned problem for human health.
Keywords: combined model; air pollution forecasting; ARIMA; support vector machine; particulate matter
 สถานการณ์มลพิษประเทศไทย ปี 2558 รอบ 6 เดือน, กรมควบคุมมลพิษ กระทรวงทรัพยากรธรรมชาติและสิ่งแวดล้อม, แหล่งที่มา : http://www.oic.go.th/FILEWEB/CABINFOCENTER3/DRAWER056/GENERAL/DATA0000/00000425.PDF, 1 ตุลาคม 2560.
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