 |
 |
Hi Dave, Maybe I'm missing some obvious situation, but how often are you going to get exactly Z=0.0000000000 (to the machine precision), unless the data at that location was previously masked to 0 as part of a previous processing step? My understanding is that within FSL, 0's are basically used to represent values with "no data" (as opposed to NaN) -- thus the options in fslstats to compute stats only on non-zero voxels. However, featquery doesn't take advantage of those particular flags. cheers, -MH On Thu, 2010-06-17 at 15:16 +0100, Dave Flitney wrote: > Huh!? Z=0 is very definitely NOT absence of data or useful information! > > On 17 Jun 2010, at 15:08, Michael Harms wrote: > > >> > >> Since exact 0's are almost always doing to reflect an absence of data at > >> that voxel, why is the default behavior to include those 0's as part of > >> the mean/median/percentile statistics? > >> > > > > Regards, Dave > > -- > Dave Flitney, IT Manager > Oxford Centre for Functional MRI of the Brain > E:[log in to unmask] W:+44-1865-222713 F:+44-1865-222717 > URL: http://www.fmrib.ox.ac.uk/~flitney