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• W2141180236 abstract "State-of-the-art stochastic models generate a volatility that explains why out-of-the-money index puts have high prices relative to the Black-Scholes benchmark. These models also adequately explain how the smirk moves up and down in response to changes in risk. However, the data indicate that the slope and the level of the smirk fluctuate largely independently. While single-factor stochastic models can capture the slope of the smile, they cannot explain such largely independent fluctuations in its level and slope over time. We propose to model these movements using a two-factor stochastic model. Because the factors have distinct correlations with market returns, and because the weights of the factors vary over time, the model generates stochastic correlation between and stock returns. Besides providing more flexible modeling of the time variation in the smirk, the model also provides more flexible modeling of the term structure. Our empirical results indicate that the model improves on the benchmark Heston model by 24% in-sample and 23% out-of-sample. The better fit results from improvements in the modeling of the term structure dimension as well as the moneyness dimension." @default.
• W2141180236 created "2016-06-24" @default.
• W2141180236 creator A5054326143 @default.
• W2141180236 creator A5063618615 @default.
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• W2141180236 date "2009-01-01" @default.
• W2141180236 modified "2023-10-01" @default.
• W2141180236 title "The Shape and Term Structure of the Index Option Smirk: Why Multifactor Stochastic Volatility Models Work so Well" @default.
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• W2141180236 doi "https://doi.org/10.2139/ssrn.961037" @default.
• W2141180236 hasPublicationYear "2009" @default.
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