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Sudden Changes and Persistence in Volatility of Korean Equity Sector Returns

Author

Listed:
  • Sang Hoon Kang

    (Pusan National University)

  • Seong-Min Yoon

    (Pusan National University)

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.

Suggested Citation

  • Sang Hoon Kang & Seong-Min Yoon, 2010. "Sudden Changes and Persistence in Volatility of Korean Equity Sector Returns," Korean Economic Review, Korean Economic Association, vol. 26, pages 431-451.
    • Handle: RePEc:kea:keappr:ker-20101231-26-2-08
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    References listed on IDEAS

    as
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    More about this item

    Keywords

    Volatility Forecasting; Regime Shift; Structural Change; ICSS Algorithm;
    All these keywords.

    JEL classification:

    • G10 - Financial Economics - - General Financial Markets - - - General (includes Measurement and Data)
    • E37 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Forecasting and Simulation: Models and Applications
    • C32 - Mathematical and Quantitative Methods - - Multiple or Simultaneous Equation Models; Multiple Variables - - - Time-Series Models; Dynamic Quantile Regressions; Dynamic Treatment Effect Models; Diffusion Processes; State Space Models
    • C52 - Mathematical and Quantitative Methods - - Econometric Modeling - - - Model Evaluation, Validation, and Selection

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