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<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Dear Eric, <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>thank you very much for
the quick answer!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>I will try it and let you
know if it worked.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Best, <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Nina<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>Von:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> <st1:PersonName
w:st="on">FieldTrip discussion list</st1:PersonName>
[mailto:FIELDTRIP@NIC.SURFNET.NL] <b><span style='font-weight:bold'>Im Auftrag
von </span></b>Eric Maris<br>
<b><span style='font-weight:bold'>Gesendet:</span></b> Dienstag, 23. November
2010 16:24<br>
<b><span style='font-weight:bold'>An:</span></b> FIELDTRIP@NIC.SURFNET.NL<br>
<b><span style='font-weight:bold'>Betreff:</span></b> Re: [FIELDTRIP]
statistics and NaNs in single channels</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Verdana><span lang=NL
style='font-size:11.0pt;font-family:Verdana;color:#1F497D'>Dear Nina,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Verdana><span lang=NL
style='font-size:11.0pt;font-family:Verdana;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Verdana><span lang=NL
style='font-size:11.0pt;font-family:Verdana;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Verdana><span lang=EN-US
style='font-size:11.0pt;font-family:Verdana;color:#1F497D'>I forgot to answer
part of your question. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Verdana><span lang=EN-US
style='font-size:11.0pt;font-family:Verdana;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Verdana><span lang=EN-US
style='font-size:11.0pt;font-family:Verdana;color:#1F497D'>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.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Verdana><span lang=EN-US
style='font-size:11.0pt;font-family:Verdana;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Verdana><span lang=EN-US
style='font-size:11.0pt;font-family:Verdana;color:#1F497D'>Best,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Verdana><span lang=EN-US
style='font-size:11.0pt;font-family:Verdana;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Verdana><span lang=EN-US
style='font-size:11.0pt;font-family:Verdana;color:#1F497D'>Eric<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Verdana><span lang=EN-US
style='font-size:11.0pt;font-family:Verdana;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Verdana><span lang=EN-US
style='font-size:11.0pt;font-family:Verdana;color:#1F497D'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
<st1:PersonName w:st="on">FieldTrip discussion list</st1:PersonName>
[mailto:FIELDTRIP@NIC.SURFNET.NL] <b><span style='font-weight:bold'>On Behalf
Of </span></b>Nina Kahlbrock<br>
<b><span style='font-weight:bold'>Sent:</span></b> dinsdag 23 november 2010
15:59<br>
<b><span style='font-weight:bold'>To:</span></b> FIELDTRIP@NIC.SURFNET.NL<br>
<b><span style='font-weight:bold'>Subject:</span></b> [FIELDTRIP] statistics
and NaNs in single channels<o:p></o:p></span></font></p>
</div>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=NL
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>Hi all, <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>I have a question concerning statistics and missing
values.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>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.).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>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).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>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?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>Thank you in advance for any help!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>Nina<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=formatvorlagearial10ptvor5ptnach5pt><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt'>- - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -<o:p></o:p></span></font></p>
<p class=formatvorlagearial10ptvor5ptnach5pt><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=formatvorlagearial10ptvor5ptnach5pt><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt'>Nina Kahlbrock<o:p></o:p></span></font></p>
<p class=formatvorlagearial10ptvor5ptnach5pt><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt'>Institute of Clinical Neuroscience and
Medical Psychology <o:p></o:p></span></font></p>
<p class=formatvorlagearial10ptvor5ptnach5pt><font size=2 face=Arial><span
style='font-size:10.0pt'>Heinrich Heine University Duesseldorf<o:p></o:p></span></font></p>
<p class=formatvorlagearial10ptvor5ptnach5pt><font size=2 face=Arial><span
style='font-size:10.0pt'>Universitaetsstr. 1<o:p></o:p></span></font></p>
<p class=formatvorlagearial10ptvor5ptnach5pt><font size=2 face=Arial><span
style='font-size:10.0pt'>40225 Düsseldorf<o:p></o:p></span></font></p>
<p class=formatvorlagearial10ptvor5ptnach5pt><font size=2 face=Arial><span
style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=formatvorlagearial10ptvor5ptnach5pt><font size=2 face=Arial><span
style='font-size:10.0pt'>Tel.: +49 211 81 18075<o:p></o:p></span></font></p>
<p class=formatvorlagearial10ptvor5ptnach5pt><font size=2 face=Arial><span
style='font-size:10.0pt'>Fax. .: +49 211 81 19916<o:p></o:p></span></font></p>
<p class=formatvorlagearial10ptvor5ptnach5pt><font size=2 face=Arial><span
style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=formatvorlagearial10ptvor5ptnach5pt><font size=2 face=Arial><span
style='font-size:10.0pt'>Mail: </span></font><span lang=FR><a
href="mailto:Nina.Kahlbrock@med.uni-duesseldorf.de"><font color=black><span
lang=DE style='color:windowtext;text-decoration:none'>Nina.Kahlbrock@med.uni-duesseldorf.de</span></font></a></span><o:p></o:p></p>
<p class=formatvorlagearial10ptvor5ptnach5pt><font size=2 face=Arial><span
lang=FR style='font-size:10.0pt'><a
href="http://www.uniklinik-duesseldorf.de/medpsychologie"><font color=black><span
lang=DE style='color:windowtext;text-decoration:none'>http://www.uniklinik-duesseldorf.de/medpsychologie</span></font></a></span><o:p></o:p></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=3 face="Times New Roman"><span lang=NL style='font-size:12.0pt'>---------------------------------------------------------------------------
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You are receiving this message because you are subscribed to <br>
the FieldTrip list. The aim of this list is to facilitate the discussion <br>
between users of the FieldTrip toolbox, to share experiences <br>
and to discuss new ideas for MEG and EEG analysis. <br>
See also http://listserv.surfnet.nl/archives/fieldtrip.html <br>
and http://www.ru.nl/neuroimaging/fieldtrip.<br>
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You are receiving this message because you are subscribed to <br>
the FieldTrip list. The aim of this list is to facilitate the discussion <br>
between users of the FieldTrip toolbox, to share experiences <br>
and to discuss new ideas for MEG and EEG analysis. <br>
See also http://listserv.surfnet.nl/archives/fieldtrip.html <br>
and http://www.ru.nl/neuroimaging/fieldtrip.<br>
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