Hi Doug, if I filter, an alternative might be the Newey-West estimator ( http://en.wikipedia.org/wiki/Newey-West_estimator), I guess? Caspar
2012/6/15 Douglas N Greve <gr...@nmr.mgh.harvard.edu> > Hi Caspar, it does not make sense to low pass filter and prewhiten. > Unfortunately, I don't have the precoloring implemented in FSFAST. > doug > > On 06/15/2012 01:36 PM, Caspar M. Schwiedrzik wrote: > > Hi! > > I am processing a resting state data set, which I would like to low > > pass filter to get rid of some artifacts. The sample will be very > > small, so I won't run a RFX GLM, but an FFX GLM and/or single subject > > analyses. > > Since the low pass filter introduces high autocorrelations, it does > > not make sense to whiten the data before the GLM. > > However, in order not to violate the assumptions of the OLS, I would > > like to use the precoloring approach described in Worsley & Friston > > 1995. Is that by any chance implemented in FSFAST, and if not, where > > would be the right place to add it? > > Thanks in advance, > > Caspar > > > > > > _______________________________________________ > > Freesurfer mailing list > > Freesurfer@nmr.mgh.harvard.edu > > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > -- > Douglas N. Greve, Ph.D. > MGH-NMR Center > gr...@nmr.mgh.harvard.edu > Phone Number: 617-724-2358 > Fax: 617-726-7422 > > Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting > FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html > > _______________________________________________ > 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. > >
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