sourcestatistics

[Matsuhashi, Masao (NIH/NINDS)]

Hi,

It is nice to see more and more people start using FieldTrip and join the
discussion here. Just reading through the posted messages gives me lots of
ideas.

I have questions about statistical measures using random re-sampling and
permutation.

i)	Where can I find the sourcestatistics.m? According to the tutorials
or documents, this script seems essential but I couldn't find it in recent
distributions of FieldTrip.

ii)	In the sourceanalysis.m, re-sampling or permutation uses lots of
memory and the computation ends up with OUT OF MEMORY. (e.g. rnd_aCf and
rnd_bCf use 2 conditions * 500 trials * 274 channels * 274 channels * 16
bytes/complex = 1.2GBytes)
Is there any way to go around this problem, such as repeating 100 trial
random re-sampling for 10 times, or must I switch to Opteron?

iii)	As expected, this is very time-consuming process. Can I somehow use
the Beowulf support feature, and if yes, how? We have Beowulf cluster
available, but the number of Matlab license is limited to 8....

Thanks,
Masao Matsuhashi
HMCS/NINDS