Thank you for your explanation. You mentioned "the stat.posclusterslabelmat will tell you the time and frequency extent of the cluster", so further I want to know are all integers in stat.posclusterslabelmat which are > 1 suggest in THIS channel at THIS frequency and at THIS timepoint, （based on my TF data calculated with slide length length, baseline and other parameters I set or factors in my data）, the p-value is lower than which I set in cfg.alpha when conducting permutation?<br><br><br><html>
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<td class="mail-subject" valign="top" style=" font-size: 13px; line-height: 1.25; color: #2c2c2e; word-break: break-all; ">Re: [FieldTrip] On meaning of numbers in posclusterslabelmat / negclusterslablemat in results of ft_freqstatistics function</td>
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<div><html><head></head><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi,<div class=""><br class=""></div><div class="">these are the clusters identified in your data. The associated statistics can be found in stat.posclusters.</div><div class="">For example, stat.posclusters(1) will give you the information on the first cluster, and the stat.posclusterslabelmat will tell you the time and frequency extent of the cluster. Please see this post <a href="https://www.fieldtriptoolbox.org/faq/how_not_to_interpret_results_from_a_cluster-based_permutation_test/" class="">https://www.fieldtriptoolbox.org/faq/how_not_to_interpret_results_from_a_cluster-based_permutation_test/</a> for important information regarding the interpretation of the cluster stats results.</div><div class=""><br class=""></div><div class="">Best,</div><div class=""><br class=""></div><div class="">Julian<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">Am 22.05.2024 um 05:19 schrieb 郭策2021220122 via fieldtrip <<a href="mailto:fieldtrip@science.ru.nl" class="">fieldtrip@science.ru.nl</a>>:</div><br class="Apple-interchange-newline"><div class=""><div style="line-height: 1.7; font-size: 14px; font-family: Arial;" class=""><div style="margin:0;" class="">Hi, </div><div style="margin:0;" class=""><br class=""></div><div style="margin:0;" class="">After conduction of cluster based permutation using ft_freqstatistics, a stat variable can be generated, containing two structs, namely poscterlabelmat and negclusterslabelmat. Both are 3-D data containing integers. I wonder the what is the meaning of the integers because they're not 0-or-1. Instead there're integers like 3, 5, 19, etc. How are these numbers determined? Do all non-zero positive integers indicate "this is a statistically significant point (p<=cfg.alpha)"? Are they determined by p-value?</div><div style="margin:0;" class="">The picture below can be generated with script</div><div style="margin:0;" class=""><div style="margin:0;" class=""> contourf(0:4:999,frex,squeeze(stat.negclusterslabelmat(22,:,101:350)),50,'linecolor','none');</div><div style="margin:0;" class=""> <span style="white-space: pre;" class="">set(gca,</span><span style="white-space: pre; color: rgb(167, 9, 245);" class="">'clim'</span><span style="white-space: pre;" class="">,[-3 3],</span><span style="white-space: pre; color: rgb(167, 9, 245);" class="">'xlim'</span><span style="white-space: pre;" class="">,[0 996]);</span></div><div class="rtcContent"><div class="lineNode"><span style="white-space: pre" class=""> xlabel(<span style="color: rgb(167, 9, 245);" class="">'Time (s)'</span>), ylabel(<span style="color: rgb(167, 9, 245);" class="">'Frequency (Hz)'</span>);</span></div></div><div style="margin:0;" class="">(Note that my TF cluster based permutation was conducted with TF data with a sampling rate of 250 and epoch ends [-0.4s 1.4s], so the script was written to draw a "map" of significant negative clusters within [0s 1s] in TF data comparison, of channel No.22 which was Cz. )</div><div style="margin:0;" class=""><span id="cid:1708ab55$1$18f9e495219$Coremail$guoce_bisu_212$163.com"><Neg_2Pri_MalePrimed_&_FemalePrimed.jpg></span></div><div style="margin:0;" class="">As you can see, there are different depths of color because of different values of non-zero positive integers. Should I say this map shows significant negative TF clusters?</div><div style="margin:0;" class=""> </div></div><div style="margin:0;" class="">Furthermore, what are differences between positve clusters and negative clusters? </div><div style="margin:0;" class="">For example, if I have 2 variables to be tested, namely TFRwave1 and TFRwave2, does postive clusters generated with</div><div style="margin:0;" class=""> [stat] = ft_freqstatistics(cfg, TFRwave1, TFRwave2);</div><div style="margin:0;" class="">equal negative clusters generated with</div><div style="margin:0;" class=""> [stat] = ft_freqstatistics(cfg, TFRwave2, TFRwave1);</div><div style="margin:0;" class="">?</div><div style="margin:0;" class=""><br class=""></div><div class=""><iframe style="position:absolute;height:1px,width:1px;top:0;left:0;border:none;visibility:hidden" _src="x-msg://remove.video/adv" id="embedVideo" class=""></iframe></div></div><img style="width:1px;height:1px" src="2236" class="">_______________________________________________<br class="">fieldtrip mailing list<br class=""><a href="https://mailman.science.ru.nl/mailman/listinfo/fieldtrip" class="">https://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a><br class="">https://doi.org/10.1371/journal.pcbi.1002202<br class=""></div></blockquote></div><br class=""></div></div></html></div>
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