Hi Batool - Yes, it would be a problem. It'd be similar to having some scans with one spatial resolution and some with another, or administering one questionnaire to some of your subjects and a different one to the others and then trying to compare the answers. If the 16 directions are a subset of the 49 directions, then you can discard the remaining 33 directions from the subjects that have 49.
Best, a.y ________________________________ From: freesurfer-boun...@nmr.mgh.harvard.edu [freesurfer-boun...@nmr.mgh.harvard.edu] on behalf of Rizvi, Batool [br2...@cumc.columbia.edu] Sent: Wednesday, March 29, 2017 8:37 AM To: freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] TRACULA - subjects with different number of directions Hi, We were wondering if it would be an issue if we used a dataset in which we included 5 subjects that have a different number of directions (49 directions) than the rest of the subjects with a standard number (16 directions). Even if the preprocessing steps work, will it be an issue comparing the subjects statistically? If so, how can we treat the 5 subjects differently, but still include them in our study? Thank you! Batool
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