Frequency analysis

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Baba on 14 Nov 2011
I have several sets of data on which I need to perform frequency analysis and compare the sets. What is the best way to perform this comparison? Other than to plot psd or fft of each set and visually compare. I'm lookinig for differences in frequency set to set, because during each set of measured data, some noise my have been introduced, which I'm trying to determine.

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