Forecasting Daily Stock Volatility: the Role of Intraday Information and Market Conditions
72 Pages Posted: 29 May 2008 Last revised: 19 Dec 2013
Date Written: May 1, 2008
Abstract
Several recent studies advocate the use of nonparametric estimators of daily price variability that exploit intraday information. This paper compares four such estimators, realised volatility, realised range, realised power variation and realised bipower variation, by examining their in-sample distributional properties and out-of-sample forecast ranking when the object of interest is the conventional conditional variance. The analysis is based on a 7-year sample of transaction prices for 14 NYSE stocks. The forecast race is conducted in a GARCH framework and relies on several loss functions. The realized range fares relatively well in the in-sample fit analysis, for instance, regarding the extent to which it brings normality in returns. However, overall the realised power variation provides the most accurate 1-day-ahead forecasts. Forecast combination of all four intraday measures produces the smallest forecast errors in about half of the sampled stocks. A market conditions analysis reveals that the additional use of intraday data on day t-1 to forecast volatility on day t is most advantageous when day t is a low volume or an up-market day. The results have implications for value-at-risk analysis.
Keywords: Conditional variance, Quadratic variation, Nonparametric estimators, Intraday prices, Superior predictive ability
JEL Classification: C53, C32, C14
Suggested Citation: Suggested Citation
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