[FieldTrip] Quick question about depsamplesregrT

[Lee, Kyoung Eun]

Dear FieldTrip users,

I have a simple quick question.
Those are my parameters for the clustering permutation test.

cfg.latency          = 'all';
cfg.channel          = 'all';
cfg.frequency        = 'all';
cfg.avgovertime      = 'no';
cfg.avgoverchan      = 'no';
cfg.avgoverfreq      = 'no';
cfg.method           = 'montecarlo';
cfg.statistic        = 'depsamplesregrT';
cfg.correctm         = 'cluster';
cfg.clusteralpha     = 0.05;
cfg.clusterstatistic = 'maxsum';
cfg.minnbchan        = 1;
cfg.tail             = 0;
cfg.clustertail      = 0;
cfg.alpha            = 0.025;
cfg.numrandomization = 1000;
cfg.parameter        = 'm';

And this is my design matrix. I only have a within-subject factor (high, low, no).

subj = 42;
design(1,1:subj) = 1:subj; design(1,subj+1:2*subj)= 1:subj; design(1,2*subj+1:3*subj)= 1:subj;
design(2,1:subj) = 1; design(2,subj+1:2*subj)= 2; design(2,2*subj+1:3*subj)= 3;

cfg.design = design;
cfg.ivar = 2;
cfg.uvar = 1;

Then, I ran the freqstatistics like this.

stat = ft_freqstatistics(cfg, High, Low, No);


If I found a significant negative cluster, does it mean there is a linear relationship of "high > low > no" or "no> low>high"?
I always confused about the direction of the effect.

Thank you so much!
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