Hi SPM experts,
We want to model the difference in dynamic processes between depression patients and health controls.
We have done the PEB and got several significant connectivity. Next, we want to check the predicted ability of the significant connectivity using cross-validation.
However, we found that the results of cross-validation would be varied when we used the index of "1 -1“, representing two groups that using the de-mean index of "-0.7 0.7". Thus, we would like to ask if the group index should be de-meaned for cross-validation? Thanks in advance.
Best,
Qunjun
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