I've been interested in these 2 questions, since I have similar issues: https://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg38213.html http://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg39282.html
What does it mean if I find a valid-appearing tract with reinit=0, but then lose it with reinit=1? How much variability should I expect in the path stats between runs using the same parameters? I haven't gotten as far as the previous question to see if statistical significance changes, but since I'm looking at longitudinal data, I expect the actual white matter changes over time to be rather small. How do the dmrirc parameters nburnin, nsample, and nkeep affect the MCMC process and results? Since the built in randomness should decrease the number of samples is increase, should I just increase nsample? Thanks, Peggy
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