[Eeglablist] paired t-test with corrected p-values

Michels Lars Lars.Michels at kispi.uzh.ch
Fri Mar 12 00:56:43 PST 2010


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
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