[FieldTrip] Degrees of freedom in Z-coherence transform

[Guillaume Dumas]

Dear Fieldtripers,

Following Maris et al. 2007 paper about "Nonparametric testing of coherence
difference" I was hesitating regarding the number of degrees of freedom to
use in the Z-coherence transform when coherence is calculated over N trials
by averaging across M non-overlapping windows in each of them. Is the df
equals to N or N*M then?

I am a little confused since in Fieldtrip, this is even 2*N that appears to
be used:
http://fieldtrip.googlecode.com/svn/trunk/statfun/ft_statfun_indepsamplesZcoh.m

Thanks for your time.

Best,

Guillaume
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