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Title:The dynamics of implied volatilities: A common principal components approach PDF Logo
Authors:Fengler, Matthias R.
Härdle, Wolfgang K.
Villa, Christophe
Issue Date:2001
Series/Report no.:Discussion Papers, Interdisciplinary Research Project 373: Quantification and Simulation of Economic Processes 2001,38
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.
Subjects:Common Principal Component Analysis
Implied Volatility Surface
Principal Component Analysis
Smile
JEL:C13
C49
G13
Persistent Identifier of the first edition:urn:nbn:de:kobv:11-10049795
Document Type:Working Paper
Appears in Collections:Discussion Papers, SFB 373, HU Berlin

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