Multiyaningrum, R., Amri, I. F., Haris, M. A., Salsabilla, H. A., Ginasputri, H. N. A., & Sintya, S. D. (2024). Forecasting the Volatility of Tuna Fish Prices in North Sumatra using the ARCH Method in the Period January - April 2024. EIGEN MATHEMATICS JOURNAL, 7(2), 93–101. https://doi.org/10.29303/emj.v7i2.236