Dear Yi:
The first eigenvariate would be essentially that time-series vector
that would account for the most variance in the set of voxels in your
VOI. It it thought to perhaps be a better estimate to use than just
the mean of all vectors.
Darren.
>Hello,
> When I did VOI analysis, a plot of the '1st eigenvariate ISM' appeared
>at the bottom. Could anyone explain to me the meaning of the 1st
>eigenvariate ISM?
> Thank you.
>
>Yi-Fen
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Darren R. Gitelman, M.D.
Cognitive Neurology and Alzheimer's Disease Center
E-mail: [log in to unmask] WWW:
http://www.brain.northwestern.edu
Voice: (312) 908-9023 Fax: (312) 908-8789
Northwestern Univ., 320 E. Superior St., Searle 11-470, Chicago, IL 60611
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