[Eeglablist] Statistics on dipole orientations

Bradley Voytek bradley.voytek at gmail.com
Fri Mar 19 15:17:48 PDT 2010


Paul:

Obviously, for the reason you've stated, you can't take the arithmetic
mean, you need to take the circular mean. If you use the circular
stats toolbox you can get the circular mean, perform one-way or
two-way stats, etc.

http://www.mathworks.com/matlabcentral/fileexchange/10676-circular-statistics-toolbox-directional-statistics

::brad

On Thu, Mar 18, 2010 at 07:43, Paul Briley <paul at ihr.mrc.ac.uk> wrote:
> Hi, I’m looking to compare dipole orientations between conditions, does
> anyone know the best way to do this? I’m currently using BESA to fit
> dipoles, which gives me an azimuth and elevation angle for each participant.
> However, averaging across participants seems problematic – orientations of 2
> degrees and 358 degrees would average to 180 degrees, despite them being
> only 4 degrees apart. In addition, dipoles can be flipped in orientation
> with no change in residual variance so I would need a method which treats,
> for example, 0 degrees and 180 degrees the same.
>
>
>
> Does anyone know where this problem has been tackled before?
>
>
>
> Thank-you,
>
> Paul.
>
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