Re: [Freesurfer] precoloring - adjusted errors

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
    >
    >
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