Hi Steve,
Thank you very much. Playing around with my data I also get the impression that preprocessing steps can have quite some impact on the results. This makes sense off course, but also leave you a bit in the dark on where these differences arise and on what to choose. Thank you for the info!
Andries
________________________________
From: FSL - FMRIB's Software Library on behalf of Steve Smith
Sent: Sun 8/30/2009 14:44
To: [log in to unmask]
Subject: Re: [FSL] Pre-whitening prior to granger causality analysis - allowed?
See, for example, the papers in PLOS by David and by Friston, then
there's the OHBM abstract by Victor Solo, and his following paper:
http://ieeexplore.ieee.org/Xplore/login.jsp?url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F4433999%2F4434000%2F04434049.pdf%3Farnumber%3D4434049&authDecision=-203
Cheers.
On 30 Aug 2009, at 13:29, Gael Varoquaux wrote:
> On Sun, Aug 30, 2009 at 01:25:19PM +0100, Steve Smith wrote:
>> Hi - because there is so much evidence now that applying Granger to
>> BOLD
>> data is potentially dodgy,
>
> While I tend to agree with you here, I have a hard time backing this
> statement. Is there any hard evidence you could point me to?
>
> Thanks a lot,
>
> Gaël
>
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Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
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