1）  品牌经验=a+b品牌信誉+误差；

    2）品牌信誉=c+d品牌经验+误差；


  数学是应该是正反函数吧。老师让测试下。 系数b 和d 是否相同。
第一个问题Try to test some cross-equations restrictions and check whether they make any difference to the results。


第二个问题，One big issue in this type of analysis is the direction of causality. Of course it cannot be solved by the type of data at hand and therefore I would suggest a critical analysis of how these issues can affect the validity of the results。


求教高手。 b和d 如果相同了。说明什么。 如果不相同又说明什么。 会对结果的有效性有多大影响。谢谢。