# freqstastics script

Bonin, Claudia (NIH/NINDS) [F] boninc at NINDS.NIH.GOV
Fri Sep 18 21:15:55 CEST 2009

```DOES ANYONE KNOW HOW TO USE THE FIELDTRIP FUNCTION FREQSTATISTICS TO RUN A KRUSKALWALLIS TEST?

-----Original Message-----
From: FieldTrip discussion list [mailto:FIELDTRIP at NIC.SURFNET.NL] On Behalf Of Bonin, Claudia (NIH/NINDS) [F]
Sent: Wednesday, September 16, 2009 1:06 PM
To: FIELDTRIP at NIC.SURFNET.NL
Subject: Re: [FIELDTRIP] freqstastics script

Hi. I am having trouble getting a freqstastics script to run to do a Kruskalwallis test. Thre freqgrandaverage works but I am having trouble with the arguments for the Kruskalwallis. I have pasted in the script and the error message in this email.  Has anyone written a script using freqsstatistics to do Kruskalwallis? I would love to see it or get some direction on the arguments that need to be assigned....Also I made up an argument for cfg.design but I don't really understand what this assignment is. Could anyone elaborate?
Thank you!
claudia Bonin

here's the error message

isnan(data.time)
??? Undefined function or method 'isnan' for input arguments of type 'cell'.

computing average power over 21 subjects
> In freqgrandaverage at 121
In tf2_virt_all_plot at 11

here's the script.....

Nsubj = 21;

for subj = 1:Nsubj
fname = ['/home/boninc/tfresults/subj' 64 + subj];
clear fr
frs(subj) = fr;
end

cfg = [];
[gr] = freqgrandaverage(cfg, frs(1), frs(2), frs(3), frs(4), frs(5), frs(6), frs(7), frs(8), frs(9), frs(10), frs(11), frs(12), frs(13), frs(14), frs(15), frs(16), frs(17), frs(18), frs(19), frs(20), frs(21));

%cfg = [];
%cfg.alpha = .05;
%cfg.method = 'stats';
%cfg.design = 1:21;
%cfg.statistic = 'kruskalwallis';
%[stat] = freqstatistics(cfg, frs(1), frs(2), frs(3), frs(4), frs(5), frs(6), frs(7), frs(8), frs(9), frs(10), frs(11), frs(12), frs(13), frs(14), frs(15), frs(16), frs(17), frs(18), frs(19), frs(20), frs(21));

clf
contourf(gr.time, gr.freq, squeeze(sum(gr.powspctrm))); colorbar
%contourf(gr.time, gr.freq, gr.powspctrm); colorbar

title '21 Subjects, RandL, RIGHT Central Motor'
xlabel 'time, sec'
ylabel 'frequency, Hz'

________________________________________
From: FieldTrip discussion list [FIELDTRIP at NIC.SURFNET.NL] On Behalf Of Hanneke Van Dijk [Hanneke.vanDijk at MED.UNI-DUESSELDORF.DE]
Sent: Thursday, September 10, 2009 7:21 AM
To: FIELDTRIP at NIC.SURFNET.NL
Subject: [FIELDTRIP] AW: [FIELDTRIP] freqstastics script

Dear Claudia,

Normally when matlab says 'undefined function for input of type ....' it means it cannot find the specific function in the paths you have defined. You can check whether neighbourselection.m is in your fieldtrip folder, if not I have attached it (version 20090428) so you can put it there. If this doesn't fix it please let me know!

Groetjes Hanneke

-----Ursprüngliche Nachricht-----
Von: FieldTrip discussion list im Auftrag von Bonin, Claudia (NIH/NINDS) [F]
Gesendet: Mi 09.09.2009 18:26
An: FIELDTRIP at NIC.SURFNET.NL
Betreff: [FIELDTRIP] freqstastics script

I am trying to do statistics on time-frequency data across 16 subjects, averaging over channels. I received back the following error about 'neighbourselection' which means nothing to me.....Does anyone have any idea what might be wrong here? I have pasted in the exact message below.
thanks!
claudia

>> cfg.statistic = 'kruskalwallis';
>> cfg.method = 'stats';
>> [s] = freqstatistics(cfg, fr, fr);
averaging over 3 channels
selected 50 time bins
selected 41 frequency bins
Warning: PACK can only be used from the MATLAB command line.
> In fieldtrip/private/prepare_timefreq_data at 305
In fieldtrip/private/statistics_wrapper at 167
In freqstatistics at 44
??? Undefined function or method 'neighbourselection' for input arguments of type
'struct'.

Error in ==> statistics_wrapper at 181
cfg = neighbourselection(cfg,varargin{1});

Error in ==> freqstatistics at 44
[stat] = statistics_wrapper(cfg, varargin{:});
----------------------------------
The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/neuroimaging/fieldtrip.

----------------------------------
The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/neuroimaging/fieldtrip.

----------------------------------
The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/neuroimaging/fieldtrip.

----------------------------------
The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/neuroimaging/fieldtrip.

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