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Hi - I would be very cautious - you could well have a biased group difference there. Cheers. > On 16 Apr 2015, at 05:23, Jason S. Lee <[log in to unmask]> wrote: > > Hi experts, > > I am trying to perform TBSS with a patient group whose b value is 800 and a control group whose b value is 1000. I wonder whether or not this difference in b-values could badly affect the result of TBSS. Can I please hear some advice in this? --------------------------------------------------------------------------- Stephen M. Smith, Professor of Biomedical Engineering Associate Director, Oxford University FMRIB Centre FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK +44 (0) 1865 222726 (fax 222717) [log in to unmask] http://www.fmrib.ox.ac.uk/~steve <http://www.fmrib.ox.ac.uk/~steve> --------------------------------------------------------------------------- Stop the cultural destruction of Tibet <http://smithinks.net/>