Good morning!
I was hoping that you could help me understand the meaning of an
interaction contrast when using randomise for TBSS data.
My two evs are behavior (EV1) and age (EV2). (These are children so
the age effect on both behavior and FA is positive). Both EVs are
demeaned.
As far as I understand:
Contrast [1 0] shows areas which have a positive relationship between
FA and behavior after correcting for the effects of age on FA.
Contrast [-1 0] shows areas which have a negative relationship between
FA and behavior after correcting for the effects of age on FA.
How would I interpret the contrasts [-1 1] and [1 -1]?
Thank you so much for your help!
Kx
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Kirstie Whitaker
Doctoral Candidate
Cognitive Control and Development Laboratory
Helen Wills Neuroscience Institute
University of California at Berkeley
tel: 510 684 2456
web: bungelab.berkeley.edu
blog: http://bungelab.blogspot.com/
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