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。

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

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由此，用植被供水指数确定了各地州的受灾面积，并建立了植被供水指数估计地面干旱指数的遥感方程。

Thus the drought area in different regions could be determined and regression equations to estimate surface drought index by vegetation supply water index were established.

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但据估计，墨西哥人的幸福感指数为22%。

But it estimates Mexican well-being at 22%.

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