Time-varying jump tails
时变跳跃尾部AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接研究资产收益的左右跳跃尾部、极值近似及尾部形状变化,最明确对应金融尾部风险方向。
时变跳跃尾部AI 解读 ↓
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We develop new methods for the estimation of time-varying risk-neutral jump tails in asset returns. In contrast to existing procedures based on tightly parameterized models, our approach imposes much fewer structural assumptions, relying on extreme-value theory approximations together with short-maturity options. The new estimation approach explicitly allows the parameters characterizing the shape of the right and the left tails to differ, and importantly for the tail shape parameters to change over time. On implementing the procedures with a panel of S&P 500 options, our estimates clearly suggest the existence of highly statistically significant temporal variation in both of the tails. We further relate this temporal variation in the shape and the magnitude of the jump tails to the underlying return variation through the formulation of simple time series models for the tail parameters.