On the jump activity index for semimartingales
半鞅的跳跃活动指数AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要以资产价格半鞅的跳跃活动和价格增量为估计对象,直接对应金融高频计量中的跳跃分析,而非尾部风险测度。
反馈分类问题半鞅的跳跃活动指数AI 解读 ↓
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Empirical evidence of asset price discontinuities or “jumps” in financial markets has been well documented in the literature. Recently, Aït-Sahalia and Jacod (2009b) defined a general “jump activity index” to describe the degree of jump activities for asset price semimartingales, and provided a consistent estimator when the underlying process contains both a continuous and a jump component. However, only large increments were used in their estimator so that the effective sample size is very small even for large sample sizes. In this paper, we explore ways to improve the Aït-Sahalia and Jacod estimator by making use of all increments, large and small. The improvement is verified through simulations. A real example is also given.