在进行模型生成的时候，拟合结果说“The model is probably unidentified. In order to achieve identifiability, it will probably be necessary to impose 1 additional constraints.”我该如何给模型增加6个约束？原则是什么？如何判断需要加约束？（内生变量已经加了残差，还是需要加一个约束）
Even though is an old question, in order to achieve identification, one of the factor loadings must be fixed to one. The variable with a fixed loading of one is called a marker variable. If this is not the problem the more simple constraint is to set one parameter equal to another parameter. Hope that help and other users
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