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_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
>
>
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