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<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>Dear statistic experts,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>I have a rather general question concerning effect
sizes. I understand that t-values give me an approximation of the effect size,
as they state how big the difference between two conditions is by taking into
account the variance and the number of observations. However, as I recall, effect
sizes (like Cohen’s d) are computed in order to find out how important
the effect is, independent of the number of observations. However, if I
understand the code correctly, dependent samples t-values are computed in a
very similar way as Cohen’s d (which is “the” value for
effect sizes), both including the variance and thus the number of observations
in their functions.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>In order to draw conclusions about the importance of the
observed effect, is it necessary to compute effect sizes like Cohen’s d or
is it sufficient to compute t-values as effect sizes for M/EEG data? If
important to compute effect sizes in a way different from t-values, does anyone
know of a function that computes effect sizes like that in FT?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>Thank you in advance for your answer.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>Best Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>Nina<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=FormatvorlageArial10ptVor5ptNach5pt><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt'>- - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -<o:p></o:p></span></font></p>
<p class=FormatvorlageArial10ptVor5ptNach5pt><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=FormatvorlageArial10ptVor5ptNach5pt><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt'>Nina Kahlbrock<o:p></o:p></span></font></p>
<p class=FormatvorlageArial10ptVor5ptNach5pt><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt'>Institute of Clinical Neuroscience and
Medical Psychology <o:p></o:p></span></font></p>
<p class=FormatvorlageArial10ptVor5ptNach5pt><font size=2 face=Arial><span
style='font-size:10.0pt'>Heinrich Heine University Duesseldorf<o:p></o:p></span></font></p>
<p class=FormatvorlageArial10ptVor5ptNach5pt><font size=2 face=Arial><span
style='font-size:10.0pt'>Universitaetsstr. 1<o:p></o:p></span></font></p>
<p class=FormatvorlageArial10ptVor5ptNach5pt><font size=2 face=Arial><span
style='font-size:10.0pt'>40225 Düsseldorf<o:p></o:p></span></font></p>
<p class=FormatvorlageArial10ptVor5ptNach5pt><font size=2 face=Arial><span
style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=FormatvorlageArial10ptVor5ptNach5pt><font size=2 face=Arial><span
style='font-size:10.0pt'>Tel.: +49 211 81 18075<o:p></o:p></span></font></p>
<p class=FormatvorlageArial10ptVor5ptNach5pt><font size=2 face=Arial><span
style='font-size:10.0pt'>Fax. .: +49 211 81 19916<o:p></o:p></span></font></p>
<p class=FormatvorlageArial10ptVor5ptNach5pt><font size=2 face=Arial><span
style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=FormatvorlageArial10ptVor5ptNach5pt><font size=2 face=Arial><span
style='font-size:10.0pt'>Mail: </span><a
href="mailto:Nina.Kahlbrock@med.uni-duesseldorf.de"><font color=black><span
style='color:windowtext;text-decoration:none'>Nina.Kahlbrock@med.uni-duesseldorf.de</span></font></a></font><o:p></o:p></p>
<p class=FormatvorlageArial10ptVor5ptNach5pt><font size=2 face=Arial><span
style='font-size:10.0pt'><a
href="http://www.uniklinik-duesseldorf.de/medpsychologie"><font color=black><span
style='color:windowtext;text-decoration:none'>http://www.uniklinik-duesseldorf.de/medpsychologie</span></font></a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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