This paper should help:
Stephan et al., NeuroImage 49(4):3099-3109 (2010)
brigitte dupont wrote:
> Dear SPM experts
>
> I am trying out a practice DCM analysis for the first time and am a
> little stuck on 2 things:
>
> 1. what is the difference between linear and non-linear DCM and how
> does one choose which to use?
>
> 2. how does one take first level results to the second level? This is
> not covered in the SPM manual, and is not obvious...
>
> merci beaucoup :)
>
> Brigitte
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