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Hi Rob, >We want to enter some covariates in a higher level feat analysis >(questionaire scores etc.). In the process of demeaning them, we finish >up with fractions, not whole numbers (as in the above example on the >web). Is this ok? No problem. Most columns of most design matrices include small numbers (<1.0). THe only issue is if the fractions are so small that the machine is treating them as zeros (ie if they're smaller than the floating point resolution of your computer). That's pretty unlikely though! Joe