Sudden Changes and Persistence in Volatility of Korean Equity Sector Returns

Sang Hoon Kang and Seong-Min Yoon
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Sang Hoon Kang: Pusan National University

Korean Economic Review, 2010, vol. 26, 431-451

Abstract: This study examines the impact of exogenous changes in volatility persistence using the GARCH model with and without shock dummies. For this purpose, we considered five weekly KOSPI 200 sector index series. Using the iterated cumulated sums of squares (ICSS) algorithm, we determined the timing of volatility changes corresponding to major economic and political events, including the 1997 Asian currency crisis, the Russia crisis of 1998, the IT bubble of 2000, the 9/11 terror attack of 2001, the Iraq war of 2003 and the global financial crisis that has been recently affecting nations worldwide. After incorporating these volatility change, volatility persistence in the GARCH model was significantly reduced. This result implies that ignoring exogenous changes overestimates volatility persistence. Thus, incorporating information on exogenous changes in conditional variance will improve the accuracy of volatility forecasting.

Keywords: Volatility Forecasting; Regime Shift; Structural Change; ICSS Algorithm (search for similar items in EconPapers)
JEL-codes: C32 C52 E37 G10 (search for similar items in EconPapers)
Date: 2010
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