Dear FreeSurfers,
We are running FreeSurfer on CentOS 4.2 and are currently in the process of updating from CentOS 4.2 to 4.3. To check stability, we ran the same data on multiple machines with the different versions of CentOS using recon-all. We also ran the same data twice on the same machine (on the following day, with no changes made). We actually found slight differences in the ROI stats for the data run twice on the same machine, (in addition to slight differences between machines.) While these differences do not seem to be significant, we are concerned about them because we do not know of any reason to expect random effects in our analysis.
here is an example of the differences found: [root@bwy-1-113mm subjects]$ grep -s caudalmid 2606/stats/lh.aparc.stats caudalmiddlefrontal 3873 2648 6807 2.155 0.735 0.119 0.023 41.641 3.388 [root@bwy-1-113mm subjects]$ grep -s caudalmid apr11run2606/stats/lh.aparc.stats caudalmiddlefrontal 3877 2644 6994 2.212 0.736 0.118 0.023 41.228 3.411
Does anyone know what may cause these differences? Is there any standard method you would use to test for stability other than looking at data such as these? Thanks! -Sasha
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