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在应用多元回归分析方法研究多个因素与某个因素的线性依存关系时,常常因为自变量的共线性而影响回归结果的准确性。为此,笔者在 F 县肝癌相关因素生态学研究中对此进行了探讨。一、基本概念1.方差膨胀因子(VIF):是衡量自变量共线程度的一种度量方法。其表达式为:
In the application of multiple regression analysis method to study the linear dependence of a number of factors and a certain factor, the accuracy of the regression result is often affected by the collinearity of the independent variables. For this reason, the author explored this issue in the study of related factors of liver cancer in F County. I. Basic Concepts 1. Variance inflation factor (VIF): A measure of the collinearity of independent variables. Its expression is: