返回一组数据点到其均值的绝对偏差的平均值。参数可以是数字或名称，数组或包含数字的引用。
Returns the average of the absolute deviations of data points from their mean. Arguments can be Numbers or names, arrays, or references that contain Numbers.
对参数设计中序贯淘汰水平法(SEL)和绝对偏差法进行了研究和改进，提出了以SEL法与绝对偏差法结合为基础的自动变间隔迭代搜索法。
The SEL and the absolute bias approach for parameter design are studied and improved, on the basis of which the variable compartment iteration searching method is advanced in this paper.
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