Usman, Mustafa, M. Yuzan Wardhana, and Mauwaddah Istiqamah. 2022. “Analysis of the Risk of Rubber Prices Using the ARCH-GARCH and VaR Methods on Farm Income in West Aceh District”. International Journal on Advanced Science, Engineering and Information Technology 12 (3):1018-22. https://doi.org/10.18517/ijaseit.12.3.13637.