Dear Soroor,
Yes, when the covariate is mean-centered, the first column corresponds to the mean. If the covariate is not mean-centered, it corresponds to the average value when the covariate is zero.
Best
Martin
> On 31 Aug 2019, at 09.13, Soroor Shafieizadegan <[log in to unmask]> wrote:
>
> Dear Martin,
>
> thank you so much, if not mean-centered the covariate, what do the PEB parameters corresponding to the first and second column of design matrix show (for example if regressor was mean-centered PEB parameters corresponding to the first column of design matrix show mean connectivity over subjects)?
>
>
> Regards,
> Soroor
>
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