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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