A Study on Outlier Detection Method for Financial Time Series Data Ha, M.H.; Kim, S.;
In this paper, we show the performance evaluation of outlier detection methods based on the GARCH model. We first introduce GARCH model and the methods of outlier detection in the GARCH model. The results of small simulation and the real KOSPI data show the out-performance of the outlier detection method over
the traditional method in the GARCH model.