机制检验：机制检验中间可以不只有一个变量嘛？

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比如理论认为X通过影响M1，再影响M2再影响Y，即X-M1-M2-Y。这种可以做机制检验吗？目前的情况是M1对X显著，M2对X也显著，但是这两个机制明显不应该并列，如果删去一个又会显得X太空洞因为M1、M2都不是外生的，直接做M2对X和M1的回归也不合适？请教各位大佬，面对这种情况应该如何处理呀？

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xuandabao 发表于 2022-3-2 14:07
比如理论认为X通过影响M1，再影响M2再影响Y，即X-M1-M2-Y。这种可以做机制检验吗？目前的情况是M1对X显著， ...

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请问友友问题解决了吗？我也碰见这个问题了