[FieldTrip] Clustering algorithm used in sourcestatistics (montecarlo)

Schoffelen, J.M. (Jan Mathijs) jan.schoffelen at donders.ru.nl
Tue Feb 28 11:45:55 CET 2017


spm_bwlabel is inspired by the image toolbox function bwlabeln. So it looks for spatial contiguity in an n-dimensional volume.

JM


J.M.Schoffelen, MD PhD
Senior Researcher, VIDI-fellow
Telephone: +31-24-3614793
Physical location: room 00.028
Donders Centre for Cognitive Neuroimaging, Nijmegen, The Netherlands



On 28 Feb 2017, at 11:39, Michał Komorowski <michak at is.umk.pl<mailto:michak at is.umk.pl>> wrote:

Hey,

Not exactly.
Function 'clusterstat' takes advantage of 'spm_bwlabel' function to clusterize data, then it computes a cluster-level statistic.

I want to know what algorithm is used: k-means? DBSCAN? Other ?

Thank you for your fast reply.

2017-02-28 11:13 GMT+01:00 Maité Crespo García <maity_winky at yahoo.es<mailto:maity_winky at yahoo.es>>:
Hi Michal,

The 'ft_statistics_montecarlo' uses as default the maxsum statistic and the algorithms for clustering are in the 'clusterstat' function, inside the private folder. Is that what you mean?

Best wishes,
Maité


El Martes 28 de febrero de 2017 1:40, Michał Komorowski <michak at is.umk.pl<mailto:michak at is.umk.pl>> escribió:




Dear Fieldtrippers,

Does anybody know what clustering algorithm is used in ft_statistics_montecarlo (ft_sourcestatistics with cfg.correctm = 'cluster') when analysing data from ft_sourceanalysis?

It seems like spm_bwlabel function is used, but I have not found an open source.

Any help would be greatly appreciated.

--
Michał Komorowski, MSc
Nicolaus Copernicus University in Toruń
Faculty of Physics, Astronomy and Informatics
Department of Informatics

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--
Michał Komorowski, MSc
Nicolaus Copernicus University in Toruń
Faculty of Physics, Astronomy and Informatics
Department of Informatics
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