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<div class="moz-cite-prefix">Hi Ramin,<br>
<br>
hope you are doing fine. For the imaginary part of coherence you
need to call ft_connectivityanalysis with cfg.output = 'imag'.<br>
Afaik, z-scoring for the imaginary part is different from doing it
for the plain coherence, so you should not use indepsamplesZcoh.
You could have a look at Guido Nolte's paper on imaginary
coherence and look it up in the methods section how he is
computing it - similar but different from what I know how the
z-scoring for coherence is computed. Thus, I am not sure how to
best do cluster-based statistics on that (that means, I know how
you could do it, but not what the best way to do it would be). Of
course, you write an own statistics function, something like
'indepsamplesZicoh'... but that would be tons of work.<br>
<br>
Good luck! I hope anyone out there has other/better ideas :)<br>
<br>
Best,<br>
Jörn<br>
<br>
On 4/5/2013 9:49 AM, Ramin Azodi wrote:<br>
</div>
<blockquote
cite="mid:CA+9+xdKA9tPFRxEgSt4GtxRNvyt49H-W2Creq2yk4WyanFoKCw@mail.gmail.com"
type="cite">
<div dir="ltr">
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<div>
<div><span dir="ltr" id=":19i">Hello,<br>
In case that I want </span>just to calculate <span
dir="ltr" id=":19h">imaginary part of coherence
instead of coherence with 'indepsamplesZcoh', </span>what
kind of operation should I do for that? can anybody lead
me through the right way ?</div>
You can find my code as following,<br>
<br>
cfg = [];<br>
cfg.method = 'mtmfft';<br>
cfg.output = 'fourier';<br>
cfg.taper = 'hanning';<br>
cfg.foilim = [12 20];<br>
freq1 = ft_freqanalysis(cfg, data1);<br>
cfg = [];<br>
cfg.method = 'mtmfft';<br>
cfg.output = 'fourier';<br>
cfg.complex = 'imag';<br>
cfg.taper = 'hanning';<br>
cfg.foilim = [12 20];<br>
freq2 = ft_freqanalysis(cfg, data2);<br>
cfg = [];<br>
cfg.method = 'montecarlo';<br>
cfg.statistic = 'indepsamplesZcoh';<br>
cfg.parameter = 'fourierspctrm';<br>
cfg.computecritval = 'yes';<br>
cfg.numrandomization = 500;<br>
cfg.design = [ones(size(freq1.fourierspctrm,1),1);<br>
2*ones(size(freq2.fourierspctrm,1),1)]';<br>
cfg.label = freq.label;<br>
stat = ft_freqstatistics(cfg, freq,freq1);<br>
<br>
</div>
Thanks in advanced for your consideration.<br>
</div>
Best Regards,<br>
</div>
Ramin Azodi<br>
<div>
<div>
<div>
<div><br>
<br>
<br>
<br>
<br>
</div>
</div>
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</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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