Dear experts,
The benefit of PEB analysis compared to other classical tests such as the t-test is the consideration of the uncertainty of estimated ECs (variance) in addition to the expectation of each ECs parameter (strength of ECs).
I used PEB analysis for ECs which was estimated by spDCM (for a rs-fMRI study) and I didn't define any covariate so the design matrix just has a column of ones; therefore, I get the average connectivities in the PEB analysis. now I have a couple of questions:
1. In this situation, is the uncertainty of ECs considered in average connections? or just each effective connection (expectation of estimated parameters) is averaged across all participants?
2. The average of each connection in the PEB analysis is different from the average of connections calculated in the t-test analysis (two-sample t-test), Is the reason for this difference not removing outliers in the PEB analysis?
Kind regards,
Soroor
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