Freqanalysis - clusterthreshold and neighbourselection

[Nina]

Dear all,



I have two questions regarding clusteranalysis.



1.	When running 'freqstatistics' on time frequency/frequency data with
the method 'montecarlo' which clusterthreshold would you use? I would think
that with the data usually not being normally distributed you would use a
nonparametric threshold. However, the default value for clusterthreshold is
'parametric'.

a.	Is there documentation about what 'nonparametric_individual' and
'nonparametric_common' mean? If yes, where can I find it?

2.	I am looking at data from our old Neuromag 122 system and used the
function 'neighbourselection' to define neighbouring channels. When checking
what 'neighbourselection' did I found that the neighbours identified were
not only the sensors surrounding the sensor of interest, but also sensors
lying far away from it. Also, not all sensors surrounding the one of
interest were included as neighbours. I used the gradfile generated by
'mne2grad122' as cfg.grad and different values for neighbourdist (4 and 3).
Does anybody have a solution for this?



Thanks in advance for your help!



Nina




----------------------------------
The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/neuroimaging/fieldtrip.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.science.ru.nl/pipermail/fieldtrip/attachments/20091002/747feb28/attachment-0001.html>