Dear James and DCM experts,
Thank you for your answer and I am sorry for my late reply.
I understood very well.
Shoichi
>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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