Hi, I would like to know whether it is a good idea to use the snr measure from *wm-anat-snr *as a covariate in lme (or glm) analyses? I find significant effects of snr on cortical area and thickness. Am I right in thinking I should be more cautious about interpreting findings in regions where wm snr has a strong/significant effect on the dependent variable?
Also, if I use it in an lme model, would it be permissible to use it as a random factor? And finally, is there any similar snr measure for gray matter? (There is of course a wm/gm contrast measure but it is not very thoroughly documented.) Thank you! yours, Lars M. Rimol, PhD Norwegian University of Science and Technology (NTNU) Trondheim, Norway
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