主要介绍回归分析，即确定自变量与因变量之间的定量关系，所建立的定量表达式称为回归方程；对自变量与因变量之间的关系进行检验；

-introduced regression analysis, identify variables and dependent variables between the quantitative relationship, the establishment of quantitative formula known as the regression equation; Right from the variables and dependent variables of the relationship between test;