

Model fit comparison mediation model 

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Hello, I have a question about the following: I have a path model with 4 IV's, 3 Mediators and one DV. Two of the four IV's are not significantly related to any of the mediators or the DV. Do I understand it corectly, that if a take another identical model except now without these two IV's, that these two models are not nested, since I have a different number of observed variables in these two models? And thus, that I can use the AIC to compare the two models, but not the Chisq. difference? Kind regards, Alex 


It is correct that a minimum requirement for two models to be nested is that they share the same set of observed variables. 


OK, clear, thanks a lot! I've read that the AIC can be used to compare model fit when models are not nested? Can I then use the AIC to compare my two models, or should you still have the same set+number of variables to make a comparison between nonnested models? 


You can use AIC to compare models that are not nested but they have to have the same DVs  otherwise the AICs are not on the same scales. 

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