AW: [FIELDTRIP] statistics and NaNs in single channels
Nina Kahlbrock
Nina.Kahlbrock at UNI-DUESSELDORF.DE
Tue Nov 23 17:02:14 CET 2010
Dear Eric,
thank you very much for the quick answer!
I will try it and let you know if it worked.
Best,
Nina
_____
Von: FieldTrip discussion list [mailto:FIELDTRIP at NIC.SURFNET.NL] Im Auftrag
von Eric Maris
Gesendet: Dienstag, 23. November 2010 16:24
An: FIELDTRIP at NIC.SURFNET.NL
Betreff: Re: [FIELDTRIP] statistics and NaNs in single channels
Dear Nina,
I forgot to answer part of your question.
The presence of NaNs in your data does not pose any statistical problem. The
only relevant issue is whether our code can deal with the NaN-structure in
your data.
Best,
Eric
From: FieldTrip discussion list [mailto:FIELDTRIP at NIC.SURFNET.NL] On Behalf
Of Nina Kahlbrock
Sent: dinsdag 23 november 2010 15:59
To: FIELDTRIP at NIC.SURFNET.NL
Subject: [FIELDTRIP] statistics and NaNs in single channels
Hi all,
I have a question concerning statistics and missing values.
I have data of 32 subjects (divided into four groups). Between these
subjects different channels were rejected due to artifacts. I would like to
avoid interpolating those channels but continue with filling up bad channels
with NaNs (i.e. subject one has channels 1, 3, and 17 filled up with NaNs,
subject two has channels 1, 7, 19, and 33 filled up with NaNs etc.).
What I would like to look at is if there are differences between groups in
certain cortical areas (I would calculate tfrs, average over certain
channels and then run a group analysis).
Does this pose a statistical problem, as there are differing numbers of
channels contributing to the average between groups? If I do not average
over channels, would it be allowed to identify significantly different
cortical areas between groups on sensor level?
Thank you in advance for any help!
Nina
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - -
Nina Kahlbrock
Institute of Clinical Neuroscience and Medical Psychology
Heinrich Heine University Duesseldorf
Universitaetsstr. 1
40225 Düsseldorf
Tel.: +49 211 81 18075
Fax. .: +49 211 81 19916
Mail: <mailto:Nina.Kahlbrock at med.uni-duesseldorf.de>
Nina.Kahlbrock at med.uni-duesseldorf.de
<http://www.uniklinik-duesseldorf.de/medpsychologie>
http://www.uniklinik-duesseldorf.de/medpsychologie
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