[FieldTrip] Choose minimun time-width of clusters for cluster based permutations on freq_statistics

["Jörn M. Horschig"]

Dear Constantino,

I'm pretty confused why you want to trick FieldTrip and put timelock 
data into a frequency structure. You are aware that there is a 
ft_timelockstatistics function that can cluster in time, aren't you? 
Anyway, imho cfg.minnbchan defines how many neighbouring samples another 
samples needs to have, and a timebin can have max. two neighbouring 
samples, so it does not make much sense here (and I think it really 
applies to channels only).

The error you describe is because FT wants to compute neighbouring 
channels, because you did not set cfg.avgoverchan='yes'. If you do that, 
it will run through smoothly without an error. However, the best way for 
you would be to write your own statfun by making a copy of the statfun 
of your choice and modifying stat.stat to be 1 if the clustersize is < 
10. That way, you could achieve what you want.

Best,
Jörn

On 7/26/2013 8:55 PM, Constantino Méndez Bértolo wrote:
> Using cfg.minnbchan = 1, 5 or 40 and cfg.neighbours = [] finds no 
> cluster (not even with minnbchan = 1) were there was a cluster before 
> (without cfg.minnbchan)
>
> Using cfg.neighbours = 'triangulation', or 'distance', with or without 
> cfg.minnbchan computes the statistics but fails prior to compute the 
> clusters in the randomizations
>
> This is the error (with neighbours) V V V
>
> Error in clusterstat>makechanneighbstructmat (line 519)
> [seld] = match_str(cfg.channel, cfg.neighbours(chan).label);
>
> Error in clusterstat (line 59)
> channeighbstructmat = makechanneighbstructmat(cfg);
>
> Error in statistics_montecarlo (line 320)
> [stat, cfg] = clusterstat(cfg, statrand, statobs,'issource',issource);
>
> Error in ft_freqstatistics (line 267)
> [stat, cfg] = statmethod(cfg, dat, cfg.design);
>
>
> While it seems it is minnbchan what will be helpful, we do not come up 
> with an idea. Maybe, besides tricking fieldtrip to think we have 
> frequency data we should also trick him to believe that points in time 
> are channels? :)
>
>
> El 26 de julio de 2013 19:54, smoratti at psi.ucm.es 
> <mailto:smoratti at psi.ucm.es> <smoratti at psi.ucm.es 
> <mailto:smoratti at psi.ucm.es>> escribió:
>
>
>     I think cfg.minnbchan, applies also to time bins.
>
>     s
>
>     ________________________________________________________
>     Stephan Moratti, PhD
>
>     see also: http://web.me.com/smoratti/
>
>     Universidad Complutense de Madrid
>     Facultad de Psicología
>     Departamento de Psicología Básica I
>     Campus de Somosaguas
>     28223 Pozuelo de Alarcón (Madrid)
>     Spain
>
>     and
>
>     Center for Biomedical Technology
>     Laboratory for Cognitive and Computational Neuroscience
>     Parque Científico y Tecnológico de la Universidad Politecnica de
>     Madrid
>     Campus Montegancedo
>     28223 Pozuelo de Alarcón (Madrid)
>     Spain
>
>
>     email: smoratti at psi.ucm.es <mailto:smoratti at psi.ucm.es>
>     Tel.: +34 679219982 <tel:%2B34%20679219982>
>
>     El 26/07/2013, a las 18:46, Constantino Méndez Bértolo escribió:
>
>>     cfg.minnbchan,
>
>
>     _______________________________________________
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>     fieldtrip at donders.ru.nl <mailto:fieldtrip at donders.ru.nl>
>     http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>
>
>
>
> -- 
> Constantino Méndez-Bértolo
> Laboratorio de Neurociencia Clínica,Centro de Tecnología Biomédica (CTB)
>
> Parque Científico y Tecnológico de la UPM, Campus de Montegancedo
>
> 28223 Pozuelo deAlarcón, Madrid, SPAIN
>
>
>
>
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-- 
Jörn M. Horschig
PhD Student
Donders Institute for Brain, Cognition and Behaviour
Centre for Cognitive Neuroimaging
Radboud University Nijmegen
Neuronal Oscillations Group
FieldTrip Development Team

P.O. Box 9101
NL-6500 HB Nijmegen
The Netherlands

Contact:
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