It is the average of the two levels. It is neither a conjunction nor
the global effect. It is similar to if you collapsed the two levels in
a single model.
Best Regards, Donald McLaren
D.G. McLaren, Ph.D.
Postdoctoral Research Fellow, GRECC, Bedford VA
Research Fellow, Department of Neurology, Massachusetts General
Hospital and Harvard Medical School
Office: (773) 406-2464
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On Mon, Jan 31, 2011 at 10:25 PM, SUBSCRIBE SPM Yihui Hung
<[log in to unmask]> wrote:
> Can anyone tell me what “the average effect of condition” in second level analysis SPM-fMRI? Assuming I have one factor with two levels, is “the average effect of condition” a conjunction or global effect of the two levels? Thanks for replies in advance!