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。

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Modern plant management involves theory computations frequently, of which the estimation of plant optimal lifetime is a regular job for the plant manager.

现代设备管理中，经常会遇到理论计算问题，其中，设备最佳使用年限的估算对于设备管理人员来说，是一项常规性工作。

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As a regular type of arithmetic estimation, measurement estimation is an important channel for early numeracy acquisition and a convenient route for teaching physical measurement.

测量估计是算术估计的一种常见形式，被看作个体数量能力早期获得的重要渠道，也可为物理测量教学提供一条有效途径。

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