| This study aims to determine and analyze the influence that Indonesian Rupiah exchange rate, world oil prices, and world gold prices have against IDX Composite in 2016. This research utilizes Generalized Auto-Regressive Conditional Heteroscedasticity (GARCH) method on 234 daily observations throughout the whole year. The result of this study stated that the Indonesian Rupiah exchange rate has a significant and negative impact, while the world gold and oil prices have a significant and positive impact on the IDX Composite in 2016. In addition to this results, the discovery and usage of GARCH method as the optimum econometric model states that the variance of residuals of IDX Composite in 2016 is also affected by residuals of the previous day, but is not affected by the variance of previous days’ residuals. |