I have a question on the following: I have a model with 6 IV's, 3 mediators M, and 1 DV. (all observed variables).
Suppose model 1 has all direct effects of the IV's on the M's, and all direct effects of the M's on the DV. All IV's are allowed to correlate.
Model 2 is the same, except that one IV is dropped from the model.
How should I compare these two models to each other? If I understand this correctly, the models are not nested? So should I then use the AIC instead of a Chi sqr difference?
Kind regards, Alexandra