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<div dir="ltr" align="left"><span class="037451613-13112012"><font face="Arial" color="#0000ff" size="2"><strong>Dear Steve
</strong></font></span></div>
<div dir="ltr" align="left"><span class="037451613-13112012"><font face="Arial" color="#0000ff" size="2"><strong></strong></font></span> </div>
<div dir="ltr" align="left"><span class="037451613-13112012"><font face="Arial" color="#0000ff" size="2"><strong>Thank you so much for your advice. My script looks now as follows:</strong></font></span></div>
<div dir="ltr" align="left"><span class="037451613-13112012"><font face="Arial" color="#0000ff" size="2"></font></span> </div>
<div dir="ltr" align="left"><span class="037451613-13112012"><font face="Courier New" size="2">
<p>cfg = [];</p>
<p>cfg.elec = elec;</p>
<p>cfg.computeprob = </font><font face="Courier New" color="#a020f0" size="2">'yes'</p>
</font><font face="Courier New" size="2">
<p>cfg.neighbours = neighbours;</p>
</font><font face="Courier New" color="#228b22" size="2">
<p>%cfg.latency = 'all';</p>
</font><font face="Courier New" size="2">
<p>cfg.frequency = </font><font face="Courier New" color="#a020f0" size="2">'all'</font><font face="Courier New" size="2">;</p>
<p>cfg.channel = </font><font face="Courier New" color="#a020f0" size="2">'all'</font><font face="Courier New" color="#228b22" size="2">%'all';%eleselection % see CHANNELSELECTION</p>
<p>%cfg.avgovertime = 'no';</p>
<p>%cfg.avgoverfreq = 'no';</p>
</font><font face="Courier New" size="2">
<p>cfg.avgoverchan = </font><font face="Courier New" color="#a020f0" size="2">'no'</font><font face="Courier New" size="2">;</p>
<p>cfg.statistic = </font><font face="Courier New" color="#a020f0" size="2">'depsamplesT'</font><font face="Courier New" size="2">;</p>
<p>cfg.numrandomization = 2^6;</font><font face="Courier New" color="#228b22" size="2">% 2^number subjects</p>
</font><font face="Courier New" size="2">
<p>cfg.correctm = </font><font face="Courier New" color="#a020f0" size="2">'cluster'</font><font face="Courier New" size="2">;</p>
<p>cfg.method = </font><font face="Courier New" color="#a020f0" size="2">'montecarlo'</font><font face="Courier New" size="2">;</p>
<p>cfg.clusteralpha = 0.05;</p>
<p>cfg.alpha = 0.05;</p>
<p>cfg.tail = 0;</p>
<p>cfg.clustertail = 0;</p>
<p>cfg.correcttail = </font><font face="Courier New" color="#a020f0" size="2">'alpha'</p>
</font><font face="Courier New" color="#228b22" size="2">
<p><font color="#000000"></font></font></p>
<p><font face="Courier New" color="#228b22" size="2"></p>
<p></p>
</font><font face="Courier New" size="2">cfg.feedback = </font><font face="Courier New" color="#a020f0" size="2">'gui'</font><font face="Courier New" size="2">;
<p></p>
<p>cfg.parameter = </font><font face="Courier New" color="#a020f0" size="2">'powspctrm'</font><font face="Courier New" size="2">;</p>
</font><font face="Courier New" color="#228b22" size="2">
<p>% cfg.design = [</p>
<p>% 1 2 3 4 1 2 3 4 % subject number</p>
<p>% 1 1 1 1 2 2 2 2 ]; % condition number</p>
<p></p>
</font><font face="Courier New" size="2">
<p>cfg.design(1,:)=[1:6,1:6]</p>
<p>cfg.design(2,:)=[ones(1,6),ones(1,6)+1]</p>
<p>cfg.uvar = 1; </font><font face="Courier New" color="#228b22" size="2">% "subject" is unit of observation</p>
</font><font face="Courier New" size="2">
<p>cfg.ivar = 2;</p>
</font><font face="Courier New" color="#228b22" size="2">
<p>% "condition" is the independent variable</p>
<p></p>
</font><font face="Courier New" size="2">
<p>stat = ft_freqstatistics(cfg,sd, ld);</p>
</font></span></div>
<div dir="ltr" align="left"><span class="037451613-13112012"><font face="Arial" size="2"></font></span> </div>
<div dir="ltr" align="left"><span class="037451613-13112012"><font face="Arial" size="2">Do you think this is now correct? We perform statistics on high-density EEG Power values and want to see whether differences that we see doing simple t-test also remain
when we correct for multiple comparison.</font></span></div>
<div dir="ltr" align="left"><span class="037451613-13112012"><font face="Arial" size="2"></font></span> </div>
<div dir="ltr" align="left"><span class="037451613-13112012"><font face="Arial" size="2">Again many thanks and all the best</font></span></div>
<div dir="ltr" align="left"><span class="037451613-13112012"><font face="Arial" size="2">Caroline</font></span></div>
<div dir="ltr" align="left"><span class="037451613-13112012"><font face="Arial" color="#0000ff" size="2"></font></span> </div>
<div dir="ltr" align="left"><span class="037451613-13112012"><font face="Arial" color="#0000ff" size="2"></font></span> </div>
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<hr tabindex="-1">
<font face="Tahoma" size="2"><b>Von:</b> fieldtrip-bounces@science.ru.nl [mailto:fieldtrip-bounces@science.ru.nl]
<b>Im Auftrag von </b>Stephen Politzer-Ahles<br>
<b>Gesendet:</b> Dienstag, 13. November 2012 13:59<br>
<b>An:</b> fieldtrip@science.ru.nl<br>
<b>Betreff:</b> Re: [FieldTrip] fieldtrip Digest, Vol 24, Issue 16<br>
</font><br>
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<div></div>
Hi Caroline,<br>
<br>
It looks like your call is missing<br>
<br>
cfg.correctm = 'cluster';<br>
cfg.tail = 0;<br>
<br>
Those are both options that I include when I do it; I'm not sure if not having those might be what's giving you the error message.<br>
<br>
Best,<br>
Steve<br>
<br>
<div class="gmail_quote">
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
Message: 2<br>
Date: Tue, 13 Nov 2012 08:02:22 +0000<br>
From: Lustenberger Caroline <<a href="mailto:Caroline.Lustenberger@kispi.uzh.ch">Caroline.Lustenberger@kispi.uzh.ch</a>><br>
To: FieldTrip discussion list <<a href="mailto:fieldtrip@science.ru.nl">fieldtrip@science.ru.nl</a>><br>
Subject: Re: [FieldTrip] Cluster statistics<br>
Message-ID:<br>
<<a href="mailto:7C66D90E0C18014E85B44B560D4D5BC81488F447@EXZH1VM.kispi.int">7C66D90E0C18014E85B44B560D4D5BC81488F447@EXZH1VM.kispi.int</a>><br>
Content-Type: text/plain; charset="us-ascii"<br>
<br>
Dear Stephen<br>
<br>
Thank you, It now perfectly works, but I always get this warning I'm not sure how to handle that:<br>
<br>
Warning: doing a two-sided test without correcting p-values or alpha-level,<br>
p-values and alpha-level will reflect one-sided tests per tail<br>
<br>
<br>
cfg.clusteralpha = 0.05;<br>
<br>
cfg.alpha = 0.05;<br>
<br>
cfg.clustertail = 0;<br>
<br>
When I want to test whether my data is significant different (direction not known, therefore two sided) with an alpha level <0.05 do I have to adjust my level to 0.025?<br>
<br>
All the Best, Caroline<br>
</blockquote>
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