[FieldTrip] ft_freqstatistics error

[Jutras, Mike]

Hello,

I'm receiving an error after attempting to run the new version ft_freqstatistics (fieldtrip-20110606). I'm attempting to run a cluster-based permutation test for two sets of time-frequency data. These data consist of 114 LFP recordings, 2 conditions. I'm not sure if I am arranging the data correctly or using the correct design, but here is what it looks like:

% data variable 1
cnd1_1 =
        label: {'AD01'}
         freq: [1x15 double]
         time: [1x126 double]
       dimord: 'subj_chan_freq_time'
    powspctrm: [4-D double]
          cfg: [1x1 struct]

>> size(cnd1_1.powspctrm)
ans =
   114     1    15   126

% data variable 2
cnd2_1 =
        label: {'AD01'}
         freq: [1x15 double]
         time: [1x126 double]
       dimord: 'subj_chan_freq_time'
    powspctrm: [4-D double]
          cfg: [1x1 struct]

>> size(cnd2_1.powspctrm)
ans =
   114     1    15   126

% code for permutation test cfg
cfg = [];
cfg.channel      = 'AD01';
cfg.avgoverchan  =  'no';
cfg.avgoverfreq  =  'no';
cfg.avgovertime =  'no';

cfg.latency      =  'all';
cfg.frequency    =  'all';
%cfg.frequency    =  'all';
cfg.parameter    =  'powspctrm';
cfg.method       =  'montecarlo';
cfg.statistic    =  'depsamplesT';

dum = ones(1, size(cnd1_1.powspctrm,1));
cfg.design       =  [dum 2.*dum; 1:size(cnd1_1.powspctrm,1) 1:size(cnd1_1.powspctrm,1)];
cfg.numrandomization  = 1000;
cfg.correctm     =  'cluster';
cfg.alpha        =  0.05;
cfg.tail         =  0;
cfg.ivar         =  1;
cfg.uvar         =  2;
cfg.feedback     =  'text';
cfg.clusterstatistic  = 'maxsum';
cfg.clusterthreshold  = 'parametric';
%cfg.clusterthreshold  = 'nonparametric_common';
cfg.clusteralpha =  0.05;
% clustercritval original value: 1.96
cfg.clustercritval    = 1.96;
cfg.clustertail  =  0;
cfg.neighbours{1}.label = 'AD01';
cfg.neighbours{1}.neighblabel = {};


>> stat=ft_freqstatistics(cfg, cnd1_1, cnd2_1);
computing statistic over the frequency range [2.058 29.950]
computing statistic over the time range [-1.000 0.250]
selection powspctrm along dimension 2
selection powspctrm along dimension 3
selection powspctrm along dimension 4
selection powspctrm along dimension 2
selection powspctrm along dimension 3
selection powspctrm along dimension 4
??? Error using ==> ft_freqstatistics at 248
the number of observations in the design does not match the number of observations in the data

Thanks for any advice,
Michael
--
Michael Jutras, Ph.D.
Postdoctoral fellow
Emory University, Yerkes National Primate Research Center
404-712-9435




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