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Dear all, in order to correlate a test-score with the beta-values of my subjects, I read beta-values from the images, before averaging over my ROI for each subject. Betas in my ROI include some NaNs for some subjects. Why is this the case (different anatomy even after normalisation?)? How should I handle this in averaging? (set them to 0 as I do now or somehow take these voxels out of the analysis (how could this be done using Matlab-code?)?) Thanks. Best wishes, Tim