Nick might have, not sure. Are you volunteering Mike :) On Wed, 20 Jun 2012, Michael Harms wrote:
> > I'm curious: For comparison to the results in that paper, has anyone > quantified the variability that results when one runs the same FS > version repeatedly on the same subject, but with a different random seed > each time? That is, how much of the difference is related to math > libraries vs. intrinsic variability that arises from the components of > FS that use a random seed? > > cheers, > -MH > > On Wed, 2012-06-20 at 10:43 -0400, Bruce Fischl wrote: >> Hi Peter >> >> thanks for the info. Feel free to post this on one of the *many* blogs >> howling for our blood :) I think that the effects in the paper reflect >> default floating point settings in gcc on 32-bit vs. 64-bit, although we >> haven't really investigated as it doesn't seem like a wise use of limited >> resources (since no one would ever do a study that way in any case). >> >> Bruce >> >> >> On Wed, 20 Jun 2012, Peter J. Molfese wrote: >> >>> We run things on an Xgrid cluster that is now a mixture of Macs running Snow >>> Leopard (10.6.8) and Lion (10.7.x). We found the results given from >>> asegstats2table and aparcstats2table are identical after running 100 >>> subjects on both Mac OS X 10.7.4 and 10.6.8 with Freesurfer 5.1. I also ran >>> a few subjects on the cluster and on individual computers (not on the >>> cluster so to speak) and the results are identical. >>> >>> Best, >>> Peter >>> >>> >>> Hi, >>> >>> The paper entitled >>> >>> ?The Effects of FreeSurfer Version, Workstation Type, >>> and Macintosh Operating System Version on Anatomical >>> Volume and Cortical Thickness Measurements?, >>> PLoSONE, Vol 7(6), e38234 (2012) >>> >>> may be of interest to all of you. It can be found at: >>> >>> http://dx.plos.org/10.1371/journal.pone.0038234 >>> >>> Cheers, >>> Ed >>> >>> >>> >>> >> _______________________________________________ Freesurfer mailing list >> Freesurfer@nmr.mgh.harvard.edu >> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information >> in this e-mail is intended only for the person to whom it is addressed. If >> you believe this e-mail was sent to you in error and the e-mail contains >> patient information, please contact the Partners Compliance HelpLine at >> http://www.partners.org/complianceline . If the e-mail was sent to you in >> error but does not contain patient information, please contact the sender >> and properly dispose of the e-mail. > > > _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
