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
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
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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 greve@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
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I don't know anything about it. Looks interesting. doug
On 06/15/2012 02:14 PM, Caspar M. Schwiedrzik wrote:
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 <greve@nmr.mgh.harvard.edu mailto:greve@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 <mailto:Freesurfer@nmr.mgh.harvard.edu> > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer -- Douglas N. Greve, Ph.D. MGH-NMR Center greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu> Phone Number: 617-724-2358 <tel:617-724-2358> Fax: 617-726-7422 <tel:617-726-7422> Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html <http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html> _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu <mailto: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.
if i come up with the code for the newey white standard error, where in selxavg3-sess would i need to plug that in? caspar
2012/6/15 Douglas N Greve greve@nmr.mgh.harvard.edu
I don't know anything about it. Looks interesting. doug
On 06/15/2012 02:14 PM, Caspar M. Schwiedrzik wrote:
Hi Doug, if I filter, an alternative might be the Newey-West estimator ( http://en.wikipedia.org/wiki/**Newey-West_estimatorhttp://en.wikipedia.org/wiki/Newey-West_estimator), I guess? Caspar
2012/6/15 Douglas N Greve <greve@nmr.mgh.harvard.edu <mailto: greve@nmr.mgh.harvard.**edu greve@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
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It won't be so simple. If you can represent your filter as a matrix, then you can set the flac.TFmtx, but you'll need to do this in multiple places. You can do a search for TFmtx in the matlab code to see where
On 06/15/2012 03:23 PM, Caspar M. Schwiedrzik wrote:
if i come up with the code for the newey white standard error, where in selxavg3-sess would i need to plug that in? caspar
2012/6/15 Douglas N Greve <greve@nmr.mgh.harvard.edu mailto:greve@nmr.mgh.harvard.edu>
I don't know anything about it. Looks interesting. doug On 06/15/2012 02:14 PM, Caspar M. Schwiedrzik wrote: Hi Doug, if I filter, an alternative might be the Newey-West estimator (http://en.wikipedia.org/wiki/ Newey-West_estimator <http://en.wikipedia.org/wiki/Newey-West_estimator>), I guess? Caspar 2012/6/15 Douglas N Greve <greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu> <mailto:greve@nmr.mgh.harvard. edu <mailto:greve@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 <mailto:Freesurfer@nmr.mgh.harvard.edu> <mailto:Freesurfer@nmr.mgh. harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu>> > https://mail.nmr.mgh.harvard. edu/mailman/listinfo/ freesurfer <https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer> -- Douglas N. Greve, Ph.D. MGH-NMR Center greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu> <mailto:greve@nmr.mgh.harvard. edu <mailto:greve@nmr.mgh.harvard.edu>> Phone Number: 617-724-2358 <tel:617-724-2358> <tel:617-724-2358 <tel:617-724-2358>> Fax: 617-726-7422 <tel:617-726-7422> <tel:617-726-7422 <tel:617-726-7422>> Bugs: surfer.nmr.mgh.harvard.edu/ fswiki/BugReporting <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> <http://surfer.nmr.mgh. harvard.edu/fswiki/ BugReporting <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting>> FileDrop: www.nmr.mgh.harvard.edu/ facility/filedrop/index.html <http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html> <http://www.nmr.mgh.harvard. edu/facility/filedrop/index. html <http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html>> ______________________________ _________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu> <mailto:Freesurfer@nmr.mgh. harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu>> https://mail.nmr.mgh.harvard. edu/mailman/listinfo/ freesurfer <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 <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. -- Douglas N. Greve, Ph.D. MGH-NMR Center greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu> Phone Number: 617-724-2358 <tel:617-724-2358> Fax: 617-726-7422 <tel:617-726-7422> Bugs: surfer.nmr.mgh.harvard.edu/ fswiki/BugReporting <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> FileDrop: www.nmr.mgh.harvard.edu/ facility/filedrop/index.html <http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html>
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