[FieldTrip] problem with clusterplot?
veniero at med.unibs.it
veniero at med.unibs.it
Mon Apr 2 11:11:30 CEST 2012
Dear Jörn,
I'm copmparing two conditions gavgM1_post5 and gavgM1_pre5.
Here the settings I'm using:
cfg = [];
cfg.channel = {'EEG'};
cfg.layout= 'biosemi64.lay';
cfg.latency = 'all';
cfg.frequency = [20 20];
cfg.avgeoverfreq = 'yes';
cfg.method = 'montecarlo';
cfg.statistic = 'indepsamplesT';
cfg.correctm = 'cluster';
cfg.clusteralpha = 0.05;
cfg.clusterstatistic = 'maxsum';
cfg.minnbchan = 2;
cfg.tail = 0;
cfg.clustertail = 0;
cfg.alpha = 0.025;
cfg.numrandomization = 500;
design = zeros(1,size(gavgM1_post5.powspctrm,1) +
size(gavgM1_pre5.powspctrm,1));
design(1,1:size(gavgM1_post5.powspctrm,1)) = 1;
design(1,(size(gavgM1_post5.powspctrm,1)+1):(size(gavgM1_post5.powspctrm,1)+...
size(gavgM1_pre5.powspctrm,1))) = 2;
cfg.design = design;
cfg.ivar = 1;
[stat] = ft_freqstatistics(cfg, gavgM1_post5, gavgM1_pre5);
For the clusterplot:
stat.raweffect = gavgM1_post5.powspctrm - gavgM1_pre5.powspctrm;
cfg = [];
cfg.alpha = 0.025;
cfg.zparam = 'raweffect';
cfg.zlim = [-1 1];
cfg.layout = 'biosemi64.lay';
ft_clusterplot(cfg, stat);
Many thanks,
Mimma
> Dear Mimma,
>
> Most likely, you specified a different alpha when calling
> ft_freqstatistics than when calling ft_clusterplot. Could you paste the
> cfg settings for both functions here, so that we can try to track down
> where exactly this error comes from?
>
> Best,
> Jörn
>
>
> On 4/1/2012 7:03 PM, veniero at med.unibs.it wrote:
>> Dear FieldTrip users,
>> I'm trying to run a cluster-based permutation tests on time-frequency
>> data. I get the result:
>> found 1 positive clusters in observed data found 0 negative clusters in
>> observed data, but I'm not able to use clusterplot because if the
>> following error:
>> ??? Error using ==> ft_clusterplot at 171
>> no clusters present with a p-value lower than the specified alpha,
>> nothing
>> to plot
>>
>> Is this possible? Maybe it's just a trivial question.
>>
>> Many thanks,
>> Mimma
>>
>>
>> _______________________________________________
>> fieldtrip mailing list
>> fieldtrip at donders.ru.nl
>> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>
>
> --
> Jörn M. Horschig
> PhD Student
> Donders Institute for Brain, Cognition and Behaviour
> Centre for Cognitive Neuroimaging
> Radboud University Nijmegen
> Neuronal Oscillations Group
>
> P.O. Box 9101
> NL-6500 HB Nijmegen
> The Netherlands
>
> Contact:
> E-Mail: jm.horschig at donders.ru.nl
> Tel: +31-(0)24-36-68493
> Web: http://www.ru.nl/donders
>
> Visiting address:
> Trigon, room 2.30
> Kapittelweg 29
> NL-6525 EN Nijmegen
> The Netherlands
>
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>
More information about the fieldtrip
mailing list