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A Structured GARCH Model of Daily Equity Return Volatility

Listed author(s):
  • Gregory Connor

    ()

This paper estimates a structural times series model of return volatility. We argue that the structural time series approach to GARCH modelling first suggested by Engle and Lee, has the potential to improve the empirical reliability of GARCH models, and greatly enhance their interpretability. In its structural form, our model has tow parts, a short-memory GARCH model with a time-varying benchmark variance, and a longer-memory exponential smoothing model of benchmark variance. In its reduced for, the model is equivalent to a restricted-coefficient version of the GARCH (2,2) model. We apply the model to daily equity index returns from seven countries over the period January 1980 - April 1997. The model significantly outperform unstructured GARCH in its ability to capture short, medium and long-term memory in daily return volatility.

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File URL: http://www.lse.ac.uk/fmg/workingPapers/discussionPapers/fmg_pdfs/dp370.pdf
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Paper provided by Financial Markets Group in its series FMG Discussion Papers with number dp370.

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Date of creation: Mar 2001
Handle: RePEc:fmg:fmgdps:dp370
Contact details of provider: Web page: http://www.lse.ac.uk/fmg/

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