Fengler, Matthias R.; Härdle, Wolfgang K.; Mammen, Enno - In: Journal of Financial Econometrics 5, 2, pp. 189-218
We propose a semiparametric factor model, which approximates the implied volatility surface (IVS) in a finite dimensional function space. Unlike standard principal component approaches typically used to reduce complexity, our approach is tailored to the degenerated design of IVS data. In...