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Allison This should work. It is close to eps (minimum number in Matlab). What contrast are you trying to set up and what is your design? Darren > -----Original Message----- > From: SPM (Statistical Parametric Mapping) > [mailto:[log in to unmask]] On Behalf Of Allison Nugent > Sent: Monday, August 04, 2008 2:08 PM > To: [log in to unmask] > Subject: Re: [SPM] correctly specifying repeated measures > mixed model in SPM5 > > I think I spoke too soon regarding my success with getting > symbolic contrasts to work. At one point, I did manage to > make this work, but now, > > sum(ones(1,n1)/n1 -ones(1,n2)/n2)) = 9.43E-16 > > instead of zero, which is exasperating! Is there something I > can change in my setup to fix this? > > Thanks! > > Allison >