检验：在回归分析中，如果有两个或两个以上的自变量，就称为多元回归。事实上，一种现象常常是与多个因素相联系的，由多个自变量的最优组合共同来预测或估计因变量，比只用一个自变量进行预测或估计更有效，更符合实际。因此多元线性回归比一元线性回归的实用意义更大。(In regression analysis, if there are two or more independent variables, it is called multiple regression (two). In fact, a phenomenon often is associated with many factors, the optimal combination of multiple variable to predict or estimate the dependent variable, compared with a variable forecast or estimates is more effective, more practical. Therefore, multiple linear regression is more practical than single linear regression.)