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利用丹江口水库 1970～ 1990年的有关数据 ,采用因子分析方法进行了分析。因子分析方法能定量地反映对事物的影响及其程度。以累计方差贡献率达到或超过 70 %为限 ,选取 2个公共因子可使数据大大简化。在本例中 ,以主成分分析法为最合适因子分析方法 ,其因子成分得分系数矩阵为 :F1=0 .2 3X1+0 .2 4X2 + 0 .2 5X3 + 0 .19X4- 0 .0 5X5- 0 .0 1X6+ 0 .2 2X7,F2 =- 0 .11X1- 0 .0 9X2 - 0 .0 6X3 + 0 .2 7X4+0 .38X5+ 0 .4 0X6+ 0 .15X7。第 1公因子F1是渔业投入产出因子 ,第 2公因子F2 是水库自然因子。
Based on the data of Danjiangkou reservoir from 1970 to 1990, the factor analysis method was used to analyze the data. Factor analysis can quantitatively reflect the impact on things and their extent. To the cumulative variance contribution rate of 70% or more limited, select two public factors can greatly simplify the data. In this example, the principal component analysis method is the most suitable factor analysis method, the factor coefficient score matrix is: F1 = 0 .2 3X1 +0 .2 4X2 +0 .2 5X3 +0 .19X4-0 .0 5X5 - 0 .0 1X6 + 0 .2 2X7, F2 = - 0 .11X1-0 .0 9X2-0 .0 6X3 +0 .2 7X4 +0 .38X5 +0 .4 0X6 +0 .15X7. The first common factor F1 is the fishery input-output factor and the second common factor F2 is the reservoir natural factor.