[FieldTrip] Nonparametric Satatics Based on "Blair and Karniski 1993" Using FieldTrip

Raphael Guex raphaelguex at yahoo.fr
Fri Sep 7 16:19:22 CEST 2018


 Hello Kamia

Two follow-up questions:

1) So, to not cluster the timepoints/channels, is it enough the change the ‘cfg.correcm’ parameter from ‘cluster’ to ‘no’ and leave the other parameters unchanged?
 > yes i think it is. 
2) if cfg.correctm = ‘no’ (and, of course, using cfg.method = 'montecarlo'), are significant values (i.e., ones rather than zeros) in stat.mask logical matrix already corrected for multiple comparisons? In other words, can these ‘ones’ in the matrix be considered as statically significant channel/timepoints between two conditions at a certain critical value?>no it is not corrected then for multiple corrections. yes, the ones are significant.
good luckraphael


    Le jeudi 6 septembre 2018 à 21:21:00 UTC+2, Kamia Kavi <kamiakavi at gmail.com> a écrit :  
 
 
Hey David,

 

Thank you very much for your tip as well as your paper. Iprinted that and will read it tomorrow.

 

Two follow-up questions:

1) So, to not cluster the timepoints/channels, is it enoughthe change the ‘cfg.correcm’ parameter from ‘cluster’ to ‘no’ and leave theother parameters unchanged?

 

2) if cfg.correctm = ‘no’ (and, of course, using cfg.method= 'montecarlo'), are significant values (i.e., ones rather than zeros) in stat.masklogical matrix already corrected for multiple comparisons? In other words, canthese ‘ones’ in the matrix be considered as statically significant channel/timepointsbetween two conditions at a certain critical value?

 

Best wishes,

 

Kamia

On Thu, Sep 6, 2018 at 7:35 PM David Groppe <david.m.groppe at gmail.com> wrote:

Hi Kamia,   The cluster-based permutation test implemented by FieldTrip is similar to the Blair & Karniski method:
http://www.fieldtriptoolbox.org/tutorial/cluster_permutation_timelock

If you set the parameters of the test such that no timepoint/electrode has any neighbours (i.e., you can't form any clusters), than it is equivalent to the Blair & Karniski method.
For an explanation of how the cluster-based test differs from Blair & Karniski, I cover that in this review/tutorial paper:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4060794/

cheers,   -David


On Thu, Sep 6, 2018 at 10:36 AM Kamia Kavi <kamiakavi at gmail.com> wrote:

Dear FieldTrip-ers,
Is there an option in FirldTrip to perform a non-parametric statistics as described in Blair and Karniski 1993?
Best wishes,
Kamia_______________________________________________
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https://doi.org/10.1371/journal.pcbi.1002202

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