<html><head><base href="x-msg://490/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Dear Aleksnadra,<div><br></div><div><div><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div lang="EN-GB" link="blue" vlink="purple"><div class="WordSection1" style="page: WordSection1; "><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 57.8pt; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; text-align: justify; text-indent: -18pt; "><span style="font-size: 9pt; font-family: TimesNewRomanPSMT; "><span>a.<span style="font: normal normal normal 7pt/normal 'Times New Roman'; "> <span class="Apple-converted-space"> </span></span></span></span>do we check all possible options (e.g. if I have three groups then I’ll swap values between 1 and 2, leave 3 unchanged, then between 1 and 3 leave 2 unchanged etc) or we do just a certain percentage of it, and what percentage?</div></div></div></span></blockquote><div><br></div><div>No, we use a montecarlo method as described in the document you sent. However, at the STUDY level, EEGLAB also allows you to interfaces statistics in Fieldtrip and you may check all possible combination when using these statistics. The percentage depends on the number of conditions. Basically, EEGLAB will perform between 2000 and 20000 permutations. The exact number is shown on the command line. You can then calculate the percentage.</div><br><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div lang="EN-GB" link="blue" vlink="purple"><div class="WordSection1" style="page: WordSection1; "><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 57.8pt; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; text-align: justify; text-indent: -18pt; "><span style="font-size: 9pt; font-family: TimesNewRomanPSMT; "><o:p></o:p></span></div><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 57.8pt; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; text-align: justify; text-indent: -18pt; "><span style="font-size: 9pt; font-family: TimesNewRomanPSMT; "><span>b.<span style="font: normal normal normal 7pt/normal 'Times New Roman'; "> <span class="Apple-converted-space"> </span></span></span></span>Would bootstrapping for the same analysis be any more reliable?</div></div></div></span></blockquote><div><br></div><div>Bootstrapping picks conditions and/or trials with replacement. In your example in (a), it means that "1" could be picked twice. Bootstrapping and permutation return similar results for most practical purposes. Both assumes that the best estimate of the population is the sample data. However, bootstrap is more rigorous since picking up one trial does not depend on what you picked before. In other words, it is a more realistic sampling of your population.</div><div><br></div><div>Best,</div><div><br></div><div>Arno</div><div><br></div><br><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div lang="EN-GB" link="blue" vlink="purple"><div class="WordSection1" style="page: WordSection1; "><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 57.8pt; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; text-align: justify; text-indent: -18pt; "><span style="font-size: 9pt; font-family: TimesNewRomanPSMT; "><o:p></o:p></span></div><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 0cm; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 0cm; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">Many thanks,<o:p></o:p></div><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 0cm; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">Aleksnadra<o:p></o:p></div></div>_______________________________________________<br>Eeglablist page:<span class="Apple-converted-space"> </span><a href="http://sccn.ucsd.edu/eeglab/eeglabmail.html" style="color: blue; text-decoration: underline; ">http://sccn.ucsd.edu/eeglab/eeglabmail.html</a><br>To unsubscribe, send an empty email to<span class="Apple-converted-space"> </span><a href="mailto:eeglablist-unsubscribe@sccn.ucsd.edu" style="color: blue; text-decoration: underline; ">eeglablist-unsubscribe@sccn.ucsd.edu</a><br>For digest mode, send an email with the subject "set digest mime" to<a href="mailto:eeglablist-request@sccn.ucsd.edu" style="color: blue; text-decoration: underline; ">eeglablist-request@sccn.ucsd.edu</a></div></span></blockquote></div><br></div></body></html>