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Hi Kelly,
<div class="">It could be that you made a small mistake in formatting the input data to ft_freqstatistics (T_LLL and T_LLH). You may want to check whether these data structures have a ‘dimord’ which reads ‘rpt_chan_freq(_time)' or ‘subj_chan_freq(_time)’.</div>
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<div class="">Best,</div>
<div class="">Jan-Mathijs</div>
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<div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">
J.M.Schoffelen<br class="">
Senior Researcher, VIDI-fellow<br class="">
Donders Centre for Cognitive Neuroimaging, Nijmegen, The Netherlands<br class="">
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<blockquote type="cite" class="">
<div class="">On 09 Jan 2017, at 22:44, Murphy, Kelly (Research Student) <<a href="mailto:murphyk5@aston.ac.uk" class="">murphyk5@aston.ac.uk</a>> wrote:</div>
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Hello Fieldtrippers,
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<div class="">I am trying to use a monte carlo permutation test using ft_freqstatistics on grandaveraged data over 8 participants for two independent conditions but I am struggling to create the correct design matrix using the following code:</div>
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<div class="">cfg = []; cfg.method = 'montecarlo'; cfg.computestat = 'yes'; <span style="font-size: 10pt;" class="">cfg.statistic = 'indepsamplesT'; cfg.numrandomization = 500; cfg.correctm = 'fdr'; </span><span style="font-size: 10pt;" class="">cfg.computecritval
= 'yes'; cfg.alpha = 0.025; cfg.tail = 0; cfg.clustertail = 0; </span><span style="font-size: 10pt;" class="">cfg.clusterstatistic = 'maxsum'; cfg.minnbchan = 2; </span></div>
<div class=""><span style="font-size: 10pt;" class="">design = zeros(1,size(T_LLL.powspctrm,1) + size(T_LLH.powspctrm,1));</span></div>
<div class="">design(1,1:size(T_LLL.powspctrm,1)) = 1;</div>
<div class="">design(1,(size(T_LLL.powspctrm,1)+1):(size(T_LLL.powspctrm,1)+<span style="font-size: 10pt;" class="">size(T_LLH.powspctrm,1))) = 2;</span></div>
<div class=""><span style="font-size: 10pt;" class="">cfg.design = design;</span></div>
<div class="">cfg.ivar = 1;</div>
<div class="">[stat] = ft_freqstatistics(cfg, T_LLL, T_LLH); </div>
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<div class="">I am left with the following error message:</div>
<div class="">"<span style="font-size: 10pt;" class="">Error using ft_freqstatistics (line 174)</span></div>
<div class="">the length of the design matrix (1) does not match the number of observations</div>
<div class="">in the data (2)"</div>
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<div class="">I am struggling to see what errors I am making and I have tried my best to adhere to the guidelines outlined on the Fieldtrip tutorials, so if anyone with a keen eye can offer any help it would be most appreciated!</div>
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<div class="">Many thanks</div>
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<div class="">Kelly</div>
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<div class=""><font color="#000080" size="1" class="">PhD candidate</font></div>
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