standard error of complex data
Karl Doron
karl.doron at GMAIL.COM
Fri Jul 30 21:42:36 CEST 2010
Hello,
I'd like to plot data from single channels/single subjects with error bars, so as
to compare peak amplitudes across different experiment conditions.
In brief, I have Hilbert transformed data filtered from 8-12Hz. Then with a
function I wrote, I pull all the trials for each condition and put them into a n X
m matrix (trials x timepoints) for each channel.
The data are still complex because I have separate analyses for phase and
amplitude. For amplitudes, I'm taking the evoked response by getting the
mean of each timepoint across trials and then taking the magnitude (abs).
For the standard error, I am first getting the standard deviation by
stdev=sqrt[ (norm(x)-mean(x)) ^2 ]
This produces a real number. For the standard error, would I then divide by
the square root of N?
Thanks for any feedback,
Karl Doron
PhD. Candidate
UCSB
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