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If it is really the case that everyone is around 1 to -1 and this person alone hits the double digits, yes I would worry. But I have known subjects who gave very large beta values. I once had a person I know participate in my experiment (they asked), and they tried really hard and had a very high behavioral score and very large Beta values compared to the rest of the sample. It can happen. 

Of course you should very carefully check everything, and their raw data as well. See if the signal in that person is unusually high or they have a high variance, or maybe some task-correlated motion which can wildly inflate the Beta values. 


On 10 June 2014 18:33, Angela J <[log in to unmask]> wrote:
Dear SPMers,

There is a subject in my design matrix (after estimation) that has much higher values than the rest of the subjects. When I click Review, select the SPM.mat and check the values on the design matrix most subjects have values between -1 and 1 but this one subject has values between 15 and -4. I checked the individual contrasts and it seems this subject has higher T-vavlues than the rest of the subjects but other than that I can't find anything unusual. Could this be the case, and is it something I should be concerned about? The estimation, contrast set-up and results all run smoothly.

Thank you in advance,
AJ