Khamrod , Sittikorn, Yupaporn Areepong, Saowanit Sukparungsee, and Rapin Sunthornwat. “Improving Process Monitoring with a New Modified EWMA Control Chart for ARMA Models: A Case Study on Palm Oil Prices in Thailand”. Thailand Statistician 24, no. 3 (June 28, 2026): 635–653. accessed September 13, 2026. https://ph02.tci-thaijo.org/index.php/thaistat/article/view/266518.