Tail-Index Estimates in Small Samples
小样本中的尾部指数估计AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要以金融收益的厚尾与尾部指数为研究对象,并应用于汇率收益数据,直接对应金融尾部风险刻画与相关估计方法。
反馈分类问题小样本中的尾部指数估计AI 解读 ↓
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Financial returns are known to be nonnormal and tend to have fat-tailed distributions. This article presents a simple methodology that accurately estimates the degree of tail fatness, characterized by the tail index, in small samples. Our method is a weighted average of Hill estimators for different threshold values that corrects for the small-sample bias apparent in the latter. Using this estimator we produce tail-index estimates for returns on exchange rates that are close to nonbiased estimates obtained from extremely large datasets. The results indicate that many documented conclusions concerning the tail behavior of financial series are likely to have overestimated the tail fatness in small samples.