系数a模型 共线性统计容差 VIF1 z1 .373 2.684z2 .344 2.905z3 .548 1.826z4 .824 1.214z5 .553 1.809z6 .885 1.130z7 .979 1.021z8 .591 1.693z9 .298 3.361a 因变量:是否扩张