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Hi all, I apologise if this is a really basic question but I can't seem to find the answer I'm looking for in the archive. I want to calculate the residuals for a particular model that included 4 task regressors plus their temporal derivatives, 8 nuisance regressors, and 6 motion parameters, as I want to compare the residuals between different models with different numbers of regressors. I understand that each varcope gives me the error related to that particular EV, but I'm not clear on how I combine them - I have looked at section 14.5 of the Jezzard et al. book but I still don't know what to do. I really appreciate your help, Clare