Thanks, Jan-Mathijs. This is really helpful, I will check the papers you referred. <div><br></div><div>Jun<br><br><div class="gmail_quote">On Fri, Jan 18, 2013 at 12:55 AM, jan-mathijs schoffelen <span dir="ltr"><<a href="mailto:jan.schoffelen@donders.ru.nl" target="_blank">jan.schoffelen@donders.ru.nl</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Hi Jun,<div><br></div><div>If you want to test whether within a subject the PLV across conditions is significantly different (in some statistical sense), you would either do a statistical test along the lines described in "<span style="border-collapse:collapse;font-family:Arial,sans-serif;font-size:13px;line-height:16px"><font color="#050505"><a href="http://scholar.google.nl/citations?view_op=view_citation&hl=nl&user=_o1t7fsAAAAJ&citation_for_view=_o1t7fsAAAAJ:zYLM7Y9cAGgC" style="font-size:16px;text-decoration:underline;outline-style:none;outline-width:initial;outline-color:initial" target="_blank">Nonparametric statistical testing of coherence differences</a>, <span>E Maris, JM Schoffelen, P Fries, </span><span>Journal of neuroscience methods 163 (1), 161-175</span></font><span style="color:rgb(102,102,102)">" or "</span></span><span style="border-collapse:collapse;font-family:Arial,sans-serif;font-size:13px;line-height:16px"><a href="http://scholar.google.nl/citations?view_op=view_citation&hl=nl&user=_o1t7fsAAAAJ&citation_for_view=_o1t7fsAAAAJ:Y0pCki6q_DkC" style="font-size:16px;text-decoration:underline;color:rgb(0,0,204);outline-style:none;outline-width:initial;outline-color:initial" target="_blank">Comparing spectra and coherences for groups of unequal size</a>, </span><span style="border-collapse:collapse;color:rgb(102,102,102);font-family:Arial,sans-serif;font-size:13px;line-height:16px">H Bokil, K Purpura, JM Schoffelen, D Thomson, P Mitra, </span><span style="border-collapse:collapse;color:rgb(102,102,102);font-family:Arial,sans-serif;font-size:13px;line-height:16px">Journal of neuroscience methods 159 (2), 337-345</span><span style="border-collapse:collapse;font-family:Arial,sans-serif;font-size:13px;line-height:16px"><span style="color:rgb(102,102,102)">". </span></span></div>
<div><span style="border-collapse:collapse;font-family:Arial,sans-serif;font-size:13px;line-height:16px"><span style="color:rgb(102,102,102)"><br></span></span></div><div>This functionality is not supported in ft_connectivityanalysis. For the former way of statistical testing, you should use ft_freqstatistics, in combination with an adjusted version of statfun_indepsamplesZcoh in order for it to compute differential PLV, rather than Z-transformed coherence difference. Alternatively, you could ask ft_connectivity to compute a jackknife estimate of the variance of the PLV, which could be used in a traditional t-test.</div>
<div><div><div><br></div><div>Best,</div><div><br></div><div>Jan-Mathijs</div><div><div class="h5"><div><br></div><div><br></div><div>On Jan 12, 2013, at 1:22 AM, Jun Wang wrote:</div><br></div></div><blockquote type="cite">
<div><div class="h5">Dear fieldtrip experts,<div> I have a question regarding to test the plv output from ft_connectivityanalysis. How can I check the significance with a statistical test based on surrogate data. the plv output didn't have the magnitude for single trials.</div>
<div><br></div><div>thanks</div><div>Jun </div></div></div>
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<div>Jan-Mathijs Schoffelen, MD PhD </div><div><br></div><div>Donders Institute for Brain, Cognition and Behaviour, <br>Centre for Cognitive Neuroimaging,<br>Radboud University Nijmegen, The Netherlands</div><div><br></div>
<div>Max Planck Institute for Psycholinguistics,</div><div>Nijmegen, The Netherlands</div><div><br></div><div><a href="mailto:J.Schoffelen@donders.ru.nl" target="_blank">J.Schoffelen@donders.ru.nl</a></div><div>Telephone: <a href="tel:%2B31-24-3614793" value="+31243614793" target="_blank">+31-24-3614793</a></div>
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