<div dir="ltr">Dear Francisco,<div><br></div><div>It seems that in your source data you probably have the average across subjects, but the individual source data for each subject is missing. You may store them in individual cells and then submit these cells to the source statistics.</div><div><br></div><div>Best,</div><div><br></div><div>Stephan</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">El jue, 17 nov 2022 a las 11:32, FRANCISCO JAVIER GÓMEZ CAMPOS via fieldtrip (<<a href="mailto:fieldtrip@science.ru.nl">fieldtrip@science.ru.nl</a>>) escribió:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div class="msg-3175404277216859868">
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Dear community,<br>
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<div>I am having problems using the ft_sourcestatistics function. I would like to use this function</div>
<div>to conduct a within-subject analysis to establish which areas show differences between two</div>
<div>experimental conditions. I mainly have doubts about two aspects, the first one is about how to</div>
<div>attach the source analysis data, and the second one is about the design of the design matrix.</div>
<div><br>
</div>
<div>Regarding the data coming from the source analysis, I have the sources separated by</div>
<div>conditions (obtained by following this tutorial <a href="https://www.fieldtriptoolbox.org/tutorial/beamformer/" target="_blank">https://www.fieldtriptoolbox.org/tutorial/beamformer/</a>):</div>
<div><br>
</div>
<div>Source analysis data for each condition:</div>
<blockquote style="margin-top:0px;margin-bottom:0px">
<div>freq: 4.8302</div>
<div>cfg: [1×1 struct]</div>
<div>dim: [85 110 132]</div>
<div>inside: [1234200×1 logical]</div>
<div>pos: [1234200×3 double]</div>
<div>method: 'average'</div>
<div>avg: [1×1 struct]</div>
</blockquote>
<blockquote style="margin-top:0px;margin-bottom:0px">
<div><br>
</div>
<div>avg:</div>
<blockquote style="margin-top:0px;margin-bottom:0px">
<div>pow: [1234200×1 double]</div>
<div>noise: [1234200×1 double]</div>
<div>filter: {1234200×1 cell}</div>
<div>label: {61×1 cell}</div>
<div>filterdimord: '{pos}_ori_chan'</div>
</blockquote>
</blockquote>
<div><br>
</div>
<div>The code I use is the following (based on this code in this tutorial</div>
<div><a href="https://www.fieldtriptoolbox.org/example/source_statistics/" target="_blank">https://www.fieldtriptoolbox.org/example/source_statistics/</a> ) :</div>
<div><br>
</div>
<blockquote style="margin-top:0px;margin-bottom:0px">
<div>design=[1 2]; %for 2 conditions</div>
<div>% run sourcestatistics using cluster based correction %</div>
<div>cfg = [];</div>
<div>cfg.dim = sourceanalysis_condition1(1).dim;</div>
<div><br>
</div>
<div>cfg.method = 'montecarlo';</div>
<div>cfg.statistic = 'ft_statfun_depsamplesT';</div>
<div>cfg.parameter = 'pow';</div>
<div>cfg.correctm = 'cluster';</div>
<div>cfg.numrandomization = 'all';</div>
<div>cfg.alpha = 0.05; % note that this only implies single-sided testing</div>
<div>cfg.tail = 0;</div>
<div>cfg.design(1,:) = [1:length(find(design==1)) 1:length(find(design==2))];</div>
<div>cfg.design(2,:) = design;</div>
<div>cfg.uvar = 1; % row of design matrix that contains unit variable (in this case: trials)</div>
<div>cfg.ivar = 2; % row of design matrix that contains independent variable (the conditions)</div>
<div>stat = ft_sourcestatistics(cfg, sourceanalysis_condition1, sourceanalysis_condition2)</div>
</blockquote>
<div><br>
</div>
<div>When I run this code, I get the following error:</div>
<blockquote style="margin-top:0px;margin-bottom:0px">
<div>Error using ft_statfun_depsamplesT (line 83)</div>
<div>The data must contain at least two units of observation (trials or subjects).</div>
</blockquote>
<div><br>
</div>
<div>I understand that my design matrix and/or the structure of sourceanalysis_condition are</div>
<div>wrong, I have tried different combinations and I cannot find the solution. I hope you can</div>
<div>guide me in this regard so that I can adapt it to the conditions of my study.</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Francisco Javier Gómez,</div>
Instituto de Biomedicina de Sevilla (IBIS)<br>
</div>
</div>
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</div></blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div><br><font face="monospace, monospace">Stephan Moratti, PhD</font></div><div><font face="monospace, monospace">Profesor de Psicología Experimental</font></div><div><font face="monospace, monospace">Departamento de Psicología Experimental</font></div><div><font face="monospace, monospace">Facultad de Psicología</font></div><div><font face="monospace, monospace">Center for Cognitive and Computational Neuroscience</font></div><div><font face="monospace, monospace">Universidad Complutense de Madrid</font></div><div><font face="monospace, monospace"><a href="mailto:smoratti@ucm.es" target="_blank">smoratti@ucm.es</a></font></div><div><br><img src="http://www.ucm.es/logo/ucm.png"><br></div><div dir="ltr"><br><div dir="ltr">La información contenida en este correo es CONFIDENCIAL, de uso exclusivo del destinatario/a arriba mencionado. Si ha recibido este mensaje por error, notifíquelo inmediatamente por esta misma vía y proceda a su eliminación, ya que ud. tiene totalmente prohibida cualquier utilización del mismo, en virtud de la legislación vigente.</div><div dir="ltr"><br></div><div dir="ltr">Los datos personales recogidos serán incorporados en la actividad de tratamiento 'Correoweb', bajo la titularidad del Vicerrectorado de Tecnologías de la Información, y en él el interesado/a podrá ejercer los derechos de acceso, rectificación, supresión u oposición ante el mismo (artículos 15-21 del Reglamento UE 2016/679 de 27 de abril de 2016).</div><div dir="ltr"><br></div><div dir="ltr"><img src="http://www.ucm.es/logo/ambiente.png"><span style="background-color:rgb(106,168,79)"> Antes de imprimir este correo piense si es necesario: el medio ambiente es cosa de todos.</span></div><div dir="ltr"><br></div><div dir="ltr">This message is private and confidential and it is intended exclusively for the addressee. If you receive this message by mistake, you should not disseminate, distribute or copy this e-mail. Please inform the sender and delete the message and attachments from your system, as it is completely forbidden for you to use this information, according to the current legislation. No confidentiality nor any privilege regarding the information is waived or lost by any mistransmission or malfunction.</div><div dir="ltr"><br></div><div dir="ltr">The personal data herein will be collected in the file "Correoweb", under the ownership of the Vice-Rectorate for Information Technologies, in which those interested may exercise their right to access, rectify, erasure or right to object the contents (article 15-21 of Regulation (EU) 2016/679, General Data Protection Regulation).</div><div dir="ltr"><br></div><div dir="ltr"><img src="http://www.ucm.es/logo/ambiente.png"> <span style="background-color:rgb(106,168,79)">Before printing this mail please consider whether it is really necessary: the environment is a concern for us all.</span></div><div><br></div></div></div></div></div></div></div></div></div>