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<p class="MsoNormal">Dear FieldTrip users,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have a simple quick question.<o:p></o:p></p>
<p class="MsoNormal">Those are my parameters for the clustering permutation test.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg.latency =
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'all'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">;
</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg.channel =
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'all'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">;
</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg.frequency =
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'all'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">;
</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg.avgovertime =
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'no'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">;
</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg.avgoverchan =
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'no'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">;
</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg.avgoverfreq =
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'no'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">;
</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg.method =
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'montecarlo'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">;</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg.statistic =
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'depsamplesregrT'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">;</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg.correctm =
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'cluster'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">;</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg.clusteralpha = 0.05;
</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg.clusterstatistic =
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'maxsum'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">;</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg.minnbchan = 1;
</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg.tail = 0;
</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg.clustertail = 0;
</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg.alpha = 0.025;
</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg.numrandomization = 1000;
</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg.parameter =
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'m'</span><span style="font-size:10.0pt;font-family:"Courier New";color:black">;</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal">And this is my design matrix. I only have a within-subject factor (high, low, no).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">subj = 42;</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">design(1,1:subj) = 1:subj; design(1,subj+1:2*subj)= 1:subj; design(1,2*subj+1:3*subj)= 1:subj;
</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">design(2,1:subj) = 1; design(2,subj+1:2*subj)= 2; design(2,2*subj+1:3*subj)= 3;
</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> </span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg.design = design;
</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg.ivar = 2;
</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg.uvar = 1;
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal">Then, I ran the freqstatistics like this.<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">stat = ft_freqstatistics(cfg, High, Low, No);</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal">If I found a significant negative cluster, does it mean there is a linear relationship of “high > low > no” or “no> low>high”?<o:p></o:p></p>
<p class="MsoNormal">I always confused about the direction of the effect. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you so much!<o:p></o:p></p>
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