请教各位老师，采用路径分析做了一篇论文，简单的一个自变量X，两个中介变量M1 M2，一个因变量Y。审稿人提出了一个修改意见（如下），这个该如何修改，求指点！pathanalysis requires that the relationship between variables is a linear additivecausal relationship. In addition, the error term of an endogenous variablecannot be related to its predecessor. The author needs to provide evidence todemonstrate the feasibility of path analysis.