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在一般的统计教科书中，有关平均指标总变动因素分析时，总是先将平均指标总变动分解为各组水平变动和各组结构变动两个因素，然后套用以下指数体系的计算公式进行因素分析：相对数：可变构成指数= 固定构成指数× 结构变动影响指数即： = （ ÷
In general statistical textbooks, when analyzing the total variation of the average indicator, the total variation of the average indicator is always decomposed into two factors: level changes of each group and structure changes of each group, and then the factor analysis is carried out by applying the following formula of the index system : Relative Number: Variable Composition Index = Fixed Composition Index × Structural Change Impact Index = (÷