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Dear FT-ers,
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<div class="">I (also) want to know how we could perform one-sample T-test using the cluster-based permutation test to compute and correct p-values.</div>
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<div class="">I noticed that many people asked about this for a long time (<a href="https://mailman.science.ru.nl/pipermail/fieldtrip/2018-August/012314.html" class="">https://mailman.science.ru.nl/pipermail/fieldtrip/2018-August/012314.html</a>). I think it's
because the one-sample T-test after baseline correction has been really a common way to analyze ERP/F data. Furthermore, in many functional studies (including fMRI studies), the first question at the second-level is if the effect of a certain contrast is non-zero
over multiple subjects, thus one-sample T-test is a really natural thing to do.</div>
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<div class="">It is possible to compare baseline-vs-activation trials at the first level, although it could be a problem if the baseline period is too short compared to the activation period, which is not really uncommon (for example, it would be rather common
to have short inter-stimulus-interval than the stimulus length itself).</div>
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<div class="">But at the second level, I have no idea how we could do that.</div>
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<div class="">I know that a permutation distribution can be generated by randomly flipping signs for one-sample T-test in permutation test, so I added another resampling method to flip signs of the half of trials in resampledesign() but the result was quite
different from the two-sample t-test comparing baseline vs activation trials. Could be there any specific reason for flipping signs would not work for cluster-based correction? One possible reason I could think of would be that the noise distribution is not
actually symmetric, thus permuting labels and flipping signs create different permutation distributions.</div>
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<div class="">Is there really no way to use cluster-based permutation test for one-sample T-test at the second level?</div>
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<div class="">Best,</div>
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<span style="caret-color: rgb(122, 122, 122); color: rgb(122, 122, 122); font-family: Helvetica; font-size: 11px; orphans: 2; widows: 2;" class="">-- </span><br style="caret-color: rgb(122, 122, 122); color: rgb(122, 122, 122); font-family: Helvetica; font-size: 11px; orphans: 2; widows: 2;" class="">
<span style="caret-color: rgb(122, 122, 122); color: rgb(122, 122, 122); font-family: Helvetica; font-size: 11px; orphans: 2; widows: 2;" class="">Seung-Goo ("SG") Kim, PhD</span><br style="caret-color: rgb(122, 122, 122); color: rgb(122, 122, 122); font-family: Helvetica; font-size: 11px; orphans: 2; widows: 2;" class="">
<br style="caret-color: rgb(122, 122, 122); color: rgb(122, 122, 122); font-family: Helvetica; font-size: 11px; orphans: 2; widows: 2;" class="">
<span style="caret-color: rgb(122, 122, 122); color: rgb(122, 122, 122); font-family: Helvetica; font-size: 11px; orphans: 2; widows: 2;" class="">Postdoctoral Research Associate</span><br style="caret-color: rgb(122, 122, 122); color: rgb(122, 122, 122); font-family: Helvetica; font-size: 11px; orphans: 2; widows: 2;" class="">
<span style="caret-color: rgb(122, 122, 122); color: rgb(122, 122, 122); font-family: Helvetica; font-size: 11px; orphans: 2; widows: 2;" class="">O-Lab, </span><span style="caret-color: rgb(122, 122, 122); color: rgb(122, 122, 122); font-family: Helvetica; font-size: 11px; orphans: 2; widows: 2;" class="">Department
of Psychology & Neuroscience, </span><span style="caret-color: rgb(122, 122, 122); color: rgb(122, 122, 122); font-family: Helvetica; font-size: 11px; orphans: 2; widows: 2;" class="">Duke University</span></div>
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<span style="caret-color: rgb(122, 122, 122); color: rgb(122, 122, 122); letter-spacing: normal; text-transform: none; white-space: normal; word-spacing: 0px; text-decoration: none; -webkit-text-stroke-width: 0px; font-family: Helvetica; font-size: 11px; orphans: 2; widows: 2;" class="">Postal: </span><font color="#7a7a7a" face="Helvetica" class=""><span style="caret-color: rgb(122, 122, 122); font-size: 11px;" class="">308
Research Drive, </span></font><span style="caret-color: rgb(122, 122, 122); color: rgb(122, 122, 122); letter-spacing: normal; text-transform: none; white-space: normal; word-spacing: 0px; text-decoration: none; -webkit-text-stroke-width: 0px; font-family: Helvetica; font-size: 11px; orphans: 2; widows: 2;" class="">Durham,
NC 27708, USA</span></div>
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<span style="caret-color: rgb(122, 122, 122); font-size: 11px; color: rgb(122, 122, 122); font-family: Helvetica; orphans: 2; widows: 2;" class=""><a href="mailto:solleo@gmail.com" class="">Email: solleo@gmail.com</a></span></div>
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