The contribution of realized covariance models to the economic value of volatility timing

Luc Bauwens and Yongdeng Xu

No E2023/20, Cardiff Economics Working Papers from Cardiff University, Cardiff Business School, Economics Section

Abstract: Realized covariance models specify the conditional expectation of a realized covariance matrix as a function of past realized covariance matrices through a GARCH-type structure. We compare the forecasting performance of several such models in terms of economic value, measured through economic loss functions, on two datasets. Our empirical results indicate that the (HEAVY-type) models that use realized volatilities yield economic value and significantly surpass the (GARCH) models that use only daily returns for daily and weekly horizons. Among the HEAVY-type models, for a dataset of twenty-nine stocks, those that are specified to capture the heterogeneity of the dynamics of the individual conditional variance processes and to allow these to differ from the correlation processes (namely, DCC-type models) are more beneficial than the models that impose the same dynamics to the variance and covariance processes (namely, BEKK-type models), whereas for the dataset of three assets, the different models perform similarly. Finally, using a directly rescaled intra-day covariance to estimate the full-day covariance provides more economic value than using the overnight returns, as the latter tend to yield noisy estimators of the overnight covariance, impairing their predictive capacity.

Keywords: volatility timing; realized volatility; high-frequency data; forecasting (search for similar items in EconPapers)
JEL-codes: C32 C58 G11 G17 (search for similar items in EconPapers)
Pages: 43 pages
Date: 2023-07
New Economics Papers: this item is included in nep-ecm, nep-ets and nep-rmg
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Working Paper: The contribution of realized covariance models to the economic value of volatility timing (2023)
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