Objective It is very difficult to discover and handle the collinearity in multiple regression.We try to find a way to deal with it in the case-control study of risk factors in lung cancer.

• 目的结合肺癌危险因素研究中变量的筛选过程，探讨在涉及较多自变量的大型多元回归分析中，变量间多重共线性的诊断和处理方法。