Hello,
In VBM analysis, ANCOVA is often used to remove global difference by
inclusion of the global mean voxel value as a confounding
covariate. Does it mean to include mean intensitiy of each scan as nusiance
variable in a ANCOVA statistic procedure? If yes, does it also mean to
derive (calculate) mean intensities of scans respectively for use?
Thanks for any suggestions.
Best,
Nissen.
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