The dynamics of implied volatilities: A common principal components approach

Matthias Fengler, Wolfgang Karl Härdle and Christophe Villa

No 2001,38, SFB 373 Discussion Papers from Humboldt University of Berlin, Interdisciplinary Research Project 373: Quantification and Simulation of Economic Processes

Abstract: It is common practice to identify the number and sources of shocks that move implied volatilities across space and time by applying Principal Components Analysis (PCA) to pooled covariance matrices of changes in implied volatilities. This approach, however, is likely to result in a loss of information, since the surface structure of implied volatilities in the maturities and moneyness dimension is neglected. In this paper we propose to estimate the implied volatility surface at each point in time nonparametrically and to analyze the implied volatility surface slice by slice with a common principal components analysis (CPCA). As opposed to traditional PCA, the basic assumption of CPCA is that the space spanned by the eigenvectors is identical across groups, whereas variances associated with the components are allowed to vary. This allows us to study a p variate random vector of k groups, say the volatility smile at p different grid points of moneyness for k maturities, simultaneously. Our evidence suggests that surface dynamics can indeed be traced back to a common eigenstructure between covariance matrices of the surface slices, which allow for the usual shift, slope, and twist interpretation of shocks to implied volatilities. This insight is a suitable starting point for VaR Monte Carlo Simulations of delta-gamma neutral, vega sensitive option portfolios.

Keywords: Common Principal Component Analysis; Implied Volatility Surface; Principal Component Analysis; Smile (search for similar items in EconPapers)
JEL-codes: C13 C49 G13 (search for similar items in EconPapers)
Date: 2001
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Citations: View citations in EconPapers (1)

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Related works:
Journal Article: The Dynamics of Implied Volatilities: A Common Principal Components Approach (2003)
Working Paper: The dynamics of implied volatilities: a common principal components approach (2003)
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