Dear Shoichi,
> Some DCM works built several models in their papers, and decided which
> model was optimal based on their Bayes factors. However, they did not
> always compare one model to the special model such as DCM_control (no
> intrinsic connection, no modulatory effects). Is it necessary that the
> Bayes factor of the "optimal" model is larger than that of the spcecial
> model?
I look forward to Klaas' formal reply, but I suggest that the DCM model
comparison be used to compare plausible models, helping to select the
'optimal' model from a set of plausible models. If the DCM_control is
simply unrealistic, it cannot be said to be 'optimal' whatever the
nominal evidence in its favour. It could however force you to look more
closely at your other models and data in case you have built in problems
inadvertently.
best wishes,
James
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