The tail index is an important parameter to decide the degree of heaviness of the tail of a distribution.

尾部指标是决定分布尾部轻重的一个重要参数。

youdao

Given an estimate for tail index, we can establish extreme return levels which is useful to investors to control the risk.

在此基础上提出用尾部指数估计尾概率，达到风险控制的目的。

youdao

The estimation of tail index for regular variation heavy-tailed distributions aroused our concern, many scholars proposed several methods, but all of them have some disadvantages.

正规变化重尾分布的尾部指数的估计方法有很多种，但都不同程度地存在一定的局限性。

youdao

There is a wide variation around the index return which at the tail can be devastating.

FORBES: Playing With Active Money Managment Is A Losing Game