期刊
JOURNAL OF ECONOMETRICS
卷 131, 期 1-2, 页码 253-284出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jeconom.2005.01.010
关键词
GARCH; out-of-sample; jumps; discrete-time model; continuous-time limit
Index option prices differ systematically from Black-Scholes prices. Out-of-the-money put prices (and in-the-money call prices) are relatively high compared to the Black-Scholes price. Motivated by these empirical facts, we develop a new discrete-time dynamic model of stock returns with inverse Gaussian innovations. The model allows for conditional skewness as well as conditional heteroskedasticity and a leverage effect. We present all analytic option pricing formula consistent with this stock return dynamic. Ail extensive empirical test of the model using S&P500 index options shows that the new inverse Gaussian GARCH model's performance is superior to a standard existing nested model for out-of-the money Puts. (c) 2005 Elsevier B.V. All rights reserved.
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