结果：以平均相对偏差和灰色绝对关联度为评价标准进行拟合精度的比较。
RESULTS: The fitting precision was compared by using mean relative error and grey absolute correlation degree as evaluation criterion.
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.
目前，工业结构变动率的计算方法主要有两种：绝对变动率和平均偏差变动率。
At present, Industrial structure change can be arrived at mainly by two means: absolute change rate and average deviation change rate.
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