Hi FSL group,
I'm running a first level FEAT analysis. I have 9 EVs: task, baseline, 6 motion regressors, and a junk file telling me the onsets where a subject didn't respond. There are 4 contrasts: task, baseline, task-baseline, and baseline-task. When I run this design, I get this error message:
"Warning: at least one EV is (close to) a linear combination of the others. You probably need to alter your design.
(Design matrix is rank deficient - ratio of min:max eigenvalues in SVD of matrix is 0)
Contrasts involving these combinations will be set to zero."
Even though I got this error message my model still ran. Is it ok to continue and ignore this message or do I need to change my model?
Best,
Dana
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