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<div class="moz-cite-prefix">Dear Haiteng,<br>
<br>
I think in the example the design matrix is wrongly computed. If
you compare the single and the group-level example, it is
described exactly the same, which does not make much sense. Afaik
it should be this instead (analogue to freq statisics on group
level):<br>
<br>
<i><small>subj = numel(sourceA.trial);<br>
design = zeros(2,2*subj);<br>
for i = 1:subj<br>
design(1,i) = i;<br>
end<br>
for i = 1:subj<br>
design(1,subj+i) = i;<br>
end<br>
design(2,1:subj) = 1;<br>
design(2,subj+1:2*subj) = 2;<br>
</small></i><br>
Let me know if this makes things better (not in today, working
from home, so better reply to this lis).<br>
<br>
Best,<br>
Jörn<br>
<br>
On 4/19/2013 10:25 AM, Haiteng Jiang wrote:<br>
</div>
<blockquote
cite="mid:CAHSK_TR1WScp+Zfa-82UQfCYY=eAsZ_5T+bwTiFjekfVUL3S3A@mail.gmail.com"
type="cite">
<div dir="ltr">Hi FTer,
<div> I am doing Cluster-based permutation statistic after
beamforming on two condition over subjects following the
tutorial <a moz-do-not-send="true"
href="http://fieldtrip.fcdonders.nl/example/source_statistics">http://fieldtrip.fcdonders.nl/example/source_statistics</a>,
but I get something funny.</div>
<div> In my case , I would expect decreased activity in the
visual and posterior area. The effect is quite strong, which
is showed in the grand average difference (log ratio to
reduce inter subject variability). However , from the
statistic , the identified areas go to the temporal area ,
which doesn't make sense at all . Please see the below and
attached pictures. I understand cluster-based permutation
test doesn't necessary pick the peak difference, but in
general it should find main different area. Any comment would
be greatly appreciated.</div>
<div><br>
</div>
<div style="">Average: </div>
<div style=""><br>
</div>
<div style=""><img
src="cid:part2.04040405.08020209@donders.ru.nl" alt="Inline
images 2" width="1167" height="829"><br>
</div>
<div style=""><br>
</div>
<div style=""><br>
</div>
<div style=""><br>
</div>
<div style="">Statistic:</div>
<div style=""><img
src="cid:part3.08090809.07050706@donders.ru.nl" alt="Inline
images 1" width="1167" height="875"><br>
</div>
<div>
Best,</div>
<div>
Haiteng<br clear="all">
<div><br>
</div>
-- <br>
<div>
<div><font face="arial, helvetica, sans-serif">Haiteng Jiang</font></div>
<div><font face="arial, helvetica, sans-serif">PhD candidate</font></div>
<div><font face="arial, helvetica, sans-serif">Neuronal
Oscillations Group</font></div>
<div><font face="arial, helvetica, sans-serif">Donders
Institute for Brain, Cognition and Behaviour</font></div>
<div><font face="arial, helvetica, sans-serif">Centre for
Cognitive Neuroimaging</font></div>
<div><font face="arial, helvetica, sans-serif">Radboud
University Nijmegen</font></div>
<div><span
style="line-height:18px;background-color:rgb(255,255,255)"><font
face="arial, helvetica, sans-serif"><br>
</font></span></div>
<div><span
style="line-height:18px;background-color:rgb(255,255,255)"><font
face="arial, helvetica, sans-serif">Visiting address</font></span></div>
<div>
<div
style="text-align:left;background-color:rgb(255,255,255)">
<div>
<span style="line-height:18px"><font face="arial,
helvetica, sans-serif">Room 2.32</font></span></div>
<div><span style="line-height:18px"><font face="arial,
helvetica, sans-serif">Donders Centre for
Cognitive Neuroimaging</font></span></div>
<div><span style="line-height:18px"><font face="arial,
helvetica, sans-serif">Kapittelweg 29</font></span></div>
<div><span style="line-height:18px"><font face="arial,
helvetica, sans-serif">6525 EN Nijmegen</font></span></div>
<div><span style="line-height:18px"><font face="arial,
helvetica, sans-serif">the Netherlands</font></span></div>
<div><span style="line-height:18px"><font face="arial,
helvetica, sans-serif"><br>
</font></span></div>
</div>
</div>
<div><font face="arial, helvetica, sans-serif"> Tel.: +31
(0)243668291</font></div>
</div>
<div><font face="arial, helvetica, sans-serif"> Web: <a
moz-do-not-send="true"
href="https://sites.google.com/site/haitengjiang/"
target="_blank">https://sites.google.com/site/haitengjiang/</a></font></div>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
fieldtrip mailing list
<a class="moz-txt-link-abbreviated" href="mailto:fieldtrip@donders.ru.nl">fieldtrip@donders.ru.nl</a>
<a class="moz-txt-link-freetext" href="http://mailman.science.ru.nl/mailman/listinfo/fieldtrip">http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a></pre>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Jörn M. Horschig
PhD Student
Donders Institute for Brain, Cognition and Behaviour
Centre for Cognitive Neuroimaging
Radboud University Nijmegen
Neuronal Oscillations Group
FieldTrip Development Team
P.O. Box 9101
NL-6500 HB Nijmegen
The Netherlands
Contact:
E-Mail: <a class="moz-txt-link-abbreviated" href="mailto:jm.horschig@donders.ru.nl">jm.horschig@donders.ru.nl</a>
Tel: +31-(0)24-36-68493
Web: <a class="moz-txt-link-freetext" href="http://www.ru.nl/donders">http://www.ru.nl/donders</a>
Visiting address:
Trigon, room 2.30
Kapittelweg 29
NL-6525 EN Nijmegen
The Netherlands</pre>
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