<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Hello Michael,<BR>I don't very sure if these could be 2 of your four answers:<BR><BR>1) I am not very sure what function you use to make the test. But I use ttest2, which gives you that you like: the fourth parameter is the <SPAN lang=EN-US></SPAN><SPAN class=Style1CharChar><SPAN lang=EN-US>tail (</SPAN></SPAN><SPAN lang=EN-US>a flag), that specifies one of three alternative hypotheses:<BR></SPAN><SPAN style="FONT-FAMILY: Symbol" lang=EN-US><SPAN><SPAN style="LINE-HEIGHT: normal; FONT-VARIANT: normal; FONT-STYLE: normal; FONT-SIZE: 7pt; FONT-WEIGHT: normal; font-size-adjust: none; font-stretch: normal"></SPAN></SPAN></SPAN><SPAN dir=ltr><SPAN lang=EN-US>tail = 0 (default) specifies the alternative, only looks at the difference;</SPAN></SPAN><SPAN style="FONT-FAMILY: Symbol" lang=EN-US><SPAN><BR><SPAN style="LINE-HEIGHT: normal; FONT-VARIANT: normal;
FONT-STYLE: normal; FONT-SIZE: 7pt; FONT-WEIGHT: normal; font-size-adjust: none; font-stretch: normal"></SPAN></SPAN></SPAN><SPAN dir=ltr><SPAN lang=EN-US>tail = 1 specifies the alternative, if the first is greater thant the second one;<BR></SPAN></SPAN><SPAN style="FONT-FAMILY: Symbol" lang=EN-US><SPAN><SPAN style="LINE-HEIGHT: normal; FONT-VARIANT: normal; FONT-STYLE: normal; FONT-SIZE: 7pt; FONT-WEIGHT: normal; font-size-adjust: none; font-stretch: normal"></SPAN></SPAN></SPAN><SPAN dir=ltr><SPAN lang=EN-US>tail = -1 specifies the alternative, if the first is less than the second one. </SPAN></SPAN><BR>
<P dir=ltr class=MsoPlainText><SPAN class=Style1CharChar><SPAN lang=EN-US>ttest2(x,y,alpha,tail)</SPAN></SPAN><SPAN lang=EN-US> </SPAN></DIV>
<P dir=ltr class=MsoPlainText><BR></DIV>
<P dir=ltr class=MsoPlainText>4) I think is only change the axis. Eve you use a pre-exitent code, you can change it.<BR></DIV>
<P dir=ltr class=MsoPlainText><BR></DIV>
<P dir=ltr class=MsoPlainText>Regarding you question 3, really I don't understand very well. I imagine that it is take frequency vectors and do the test<BR></DIV>
<P dir=ltr class=MsoPlainText><BR></DIV>
<P dir=ltr class=MsoPlainText>Have a nice weekend.<BR><BR><BR></DIV>
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<DIV>Carlos A. Mugruza V.</DIV>
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<DIV><BR>Eeglablist] paired t-test with corrected p-values<B>Michels Lars</B> <A title="[Eeglablist] paired t-test with corrected p-values" href="mailto:eeglablist%40sccn.ucsd.edu?Subject=Re:%20%5BEeglablist%5D%20paired%20t-test%20with%20corrected%20p-values&In-Reply-To=%3CFD1E6887BC99C341800CBFD7ABC2F9C201EB14E2%40exzh1.kispi.int%3E">Lars.Michels at kispi.uzh.ch </A><BR><I>Fri Mar 12 00:56:43 PST 2010</I> </DIV>
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<!--beginarticle--><PRE>Dear all,
I calculated in eeglab a paired t-test between two conditions with
corrected p-values (p < 0.05, FDR).
I used the study option for this and just tested it for two subjects,
just as a proof of principle
The panel on the right of the attached image shows the "significant"
differences between the two conditions.
However, I have four questions:
1) How do I know the direction of the statistical test, i.e. does the
grey regions indicate the significant differences for L2 > L5 or does
they simply show all significant differences (L2 > L5 and L5 > L2)?
2) Is it possible to plot the statistical map on the electrode level,
i.e. to see which electrodes reflecting the strongest effect?
3) Is it possible to calculate the test directly for predefined bands
(5-7 Hz etc)?
4) Why is the limit of the y-axis 0.1 and not 0.05. Is this because the
effects are always above 0.1?
Thanks in advance,
Lars
</PRE>
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