Forecasting Shallot Prices in West Sumatra Province Using the Fuzzy Time Series Method of the Singh Model and the Cheng Model. ujsds [Internet]. 2022 Jan. 12 [cited 2026 Oct. 5];1(1):8-15. Available from: https://ujsds.ppj.unp.ac.id/index.php/ujsds/article/view/7