因子分析在农业气候区划建立模型中的应用

APPLICATION OF FACTOR ANALYSIS IN ESTABLISHING MODEL FOR REGIONAL PLANNING OF AGRICULTURE METEOROLOGY

该文以燕山山区的迁西县为例,阐述了在农业气候区划中,应用因子分析建立年降水量模型的步骤,并对模型的适宜性进行了评价。结果表明:因子分析在建立年降水量模型中,适宜范围有一定的限制。即:当自变量与因变量线性相关较差,且公共因子代表的主要自变量与因变量的相关系数相差较小时,适宜建立因子回归模型;当自变量与因变量线性相关较好,且公共因子代表的主要自变量与因变量的相关系数相差较大时,不适宜建立因子回归模型。

This paper takes Qianxi County as an example,expounds the steps of applying factor analysis to establish model for annual rainfall in agriculture meteorology regional planning;and evaluates the adaptability of this model.The results show that there is certain limitation in the adaptable scope for factor analysis in establishing model for annual rainfall,namely when linearity correlation between independent variable and cause variable is relatively poor,and the correlation coefficient between major independent variable represented by public factors and cause variable possesses smaller discrepancy,it is suitable to establish factor regress model;when linearity correlation between independent variable and cause variable is relatively good,and the correlation coefficient between major independent variable represented by public factors and cause variable possesses larger discrepancy,it is inaptitude to establish factor regress model.