<div dir="ltr">Dear Ahmed,<div><br></div><div><span style="color:rgb(0,0,0);font-family:HelveticaNeue,'Helvetica Neue',Helvetica,Arial,'Lucida Grande',sans-serif;font-size:13.3333330154419px">> How much the minimum size of subject is required in an ERP experiment?</span><br></div><div><br></div><div>Friston says 16. Below I copied an excerpt from Friston (2012) 'Ten ironic rules for non-statistical reviewers' I haven't read the paper in details and I hope he is not ironic in this part :-)</div><div><br></div><div><div>In conclusion, we have framed a fallacy of classical inference in terms of effect sizes and have argued that the optimum experimental design should sensitize inference to large effect sizes, while desensitizing inference to trivial effect sizes. For classical inference, based on alpha(0), this leads to an optimum number of subjects of about 16.</div></div><div class="gmail_extra"><br></div><div class="gmail_extra">Makoto</div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Jun 20, 2015 at 10:31 AM, Ahmed Almurshedi <span dir="ltr"><<a href="mailto:ahmed19875000@yahoo.com" target="_blank">ahmed19875000@yahoo.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div><div style="color:rgb(0,0,0);font-family:HelveticaNeue,'Helvetica Neue',Helvetica,Arial,'Lucida Grande',sans-serif;font-size:13px;background-color:rgb(255,255,255)"><div><span>Dear All,</span></div><div><br></div><div dir="ltr">I can I see i variety of ERP experiments some researcher used very wide range of participant may exceed 100 samples.</div><div dir="ltr">While some others deals with limited number of samples which maybe around 12 subjects.</div><div dir="ltr">My question is:<br></div><div dir="ltr">How much the minimum size of subject is required in an ERP experiment?</div><div dir="ltr">What is the criteria to choose the number of participants?</div><div dir="ltr">If so how to calculate it statistically?<br><span></span></div><div><br><span></span></div><div><span></span></div><div> I have goggled it and find some suggest around 30-40 subjects. as in the following link<br></div><div><div dir="ltr"> <a href="http://www.sandsresearch.com/WhitePaperSampleSize.aspx" target="_blank">Sands Research - White Paper: Sample Size Analysis for Brainwave Collection (EEG) Methodologies</a></div><div dir="ltr"><br></div></div><div style="width:450px;font-family:Georgia,Times,'Times New Roman',serif;margin-top:5px;margin-bottom:5px;background-color:rgb(255,255,255)"><table style="width:450px;height:170px;display:block" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td colspan="8" style="height:1px;font-size:1px;border-collapse:collapse;background-color:rgb(229,229,229)"><div style="min-height:1px;font-size:1px;line-height:0px;background-color:rgb(229,229,229)"> </div></td></tr><tr><td rowspan="5" style="width:1px;font-size:1pt;border-collapse:collapse;background-color:rgb(229,229,229)"><div style="width:1px;font-size:1pt;background-color:rgb(229,229,229)"> </div></td><td rowspan="5" style="vertical-align:middle;width:168px;height:168px;border-collapse:collapse;background-color:rgb(0,0,0)"><div style="width:168px" align="center"><a href="http://www.sandsresearch.com/WhitePaperSampleSize.aspx" style="text-decoration:none!important;color:rgb(0,0,0)!important" target="_blank"><img alt="image" src="http://www.sandsresearch.com/samplesizegraph.jpg" style="display: block; margin: auto;" height="101" width="168"></a></div></td><td rowspan="5" style="width:1px;font-size:0pt;border-collapse:collapse;background-color:rgb(229,229,229)"><div style="width:1px;font-size:1pt;background-color:rgb(229,229,229)"> </div></td><td rowspan="5" style="width:14px;font-size:0pt;border-collapse:collapse;background-color:rgb(255,255,255)"><div style="width:14px;font-size:14pt;background-color:rgb(255,255,255)"> </div></td><td colspan="2" style="height:6px;font-size:0pt;border-collapse:collapse;background-color:rgb(255,255,255)"><div style="min-height:6px;font-size:6pt;background-color:rgb(255,255,255)"> </div></td><td rowspan="5" style="width:20px;font-size:0pt;border-collapse:collapse;background-color:rgb(255,255,255)"><div style="width:20px;font-size:20pt;background-color:rgb(255,255,255)"> </div></td><td rowspan="5" style="width:1px;font-size:1pt;border-collapse:collapse;background-color:rgb(229,229,229)" width="1"><div style="width:1px;font-size:1pt;background-color:rgb(229,229,229)"> </div></td></tr><tr><td colspan="2" style="width:100%;vertical-align:middle;font-family:Georgia,Times,'Times New Roman',serif"><div style="line-height:16.5px;min-height:135px;width:245px;background-color:rgb(255,255,255)"><div style="word-wrap:break-word;word-break:break-all"><span></span><span></span><a href="http://www.sandsresearch.com/WhitePaperSampleSize.aspx" style="line-height:100%;font-size:18px;display:block;text-decoration:none!important;color:rgb(0,0,0)!important" target="_blank"><span style="margin:0px 0px 3px;font-weight:normal;font-size:18px;line-height:21px;max-height:43px;color:rgb(0,0,0);display:inline-block;overflow:hidden!important">Sands Research - White Paper: Sample Size Analysis for B...</span></a></div></div></td></tr><tr><td colspan="2" style="height:4px;font-size:0pt;border-collapse:collapse;background-color:rgb(255,255,255)"><div style="min-height:4px;font-size:4pt;background-color:rgb(255,255,255)"></div></td></tr><tr><td style="vertical-align:middle;font-family:Arial,'Helvetica Neue',Helvetica,sans-serif"><div style="font-size:0pt"><a href="http://www.sandsresearch.com/WhitePaperSampleSize.aspx" style="color:black;text-decoration:none!important" target="_blank"><span style="display:inline-block;line-height:11px;max-width:145px;min-width:85px;overflow:hidden;max-height:13px;word-break:break-all"><span style="vertical-align:middle;font-size:9px;line-height:11px;color:rgb(153,153,153)">View on <span style="font-weight:bold">www.sandsresearch...</span></span></span></a></div></td><td style="vertical-align:middle;width:100px;font-family:Arial,'Helvetica Neue',Helvetica,sans-serif"><div style="max-width:100px;min-width:80px;overflow:hidden;text-align:right;line-height:11px;max-height:13px;font-size:0pt"><span style="vertical-align:middle;font-size:9px;line-height:11px;color:rgb(153,153,153)">Preview by Yahoo</span></div></td></tr><tr><td colspan="2" style="height:9px;font-size:0pt;border-collapse:collapse;background-color:rgb(255,255,255)"><div style="min-height:9px;font-size:9pt;background-color:rgb(255,255,255)"></div></td></tr><tr><td colspan="8" style="height:1px;font-size:1px;border-collapse:collapse;background-color:rgb(229,229,229)"><div style="min-height:1px;font-size:1px;line-height:0px;background-color:rgb(229,229,229)"> </div></td></tr></tbody></table></div><div><br></div><div><br></div><div dir="ltr">Please share your comments..</div><span class=""><font color="#888888"><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><b>Ahmed Almurshedi</b></div><div dir="ltr"> </div><div> </div></font></span></div></div><br>_______________________________________________<br>
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