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I try to perform data analysis on wind power production. Data consist in 17520 points, corresponding to the production averaged over 30 minutes over the 365 days of the year.

I somehow expect to see a periodic pattern, at least some day/night variations (1/2 day period). However, I don't see any frequency single out in the Fourier spectrum.

Am I doing something wrong or are data just flat noise ?

Data are (hopefully) available here

NbPt = Length[dataWind]
dt = 1/48;
time = dt*NbPt;
wgrid = RotateRight[1/(NbPt*dt)*Range[-(NbPt/2), NbPt/2 - 1], NbPt/2];
SF = Transpose[{wgrid, Abs[Fourier[dataWind]]}]
ListPlot[SF, Joined -> True, PlotRange -> {{-2, 2}, All}, 
 Frame -> True]

and the result I get is the following enter image description here

DSuchet
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    It looks like you have a dominant mean value. You may find it useful to look here Http://mathematica.stackexchange.com/a/85167/12558 for some information on how to set up your axis. – Hugh Mar 01 '17 at 11:12
  • Yes in deed, substracting a mean tendency helped reading the data. Thanks. – DSuchet Mar 01 '17 at 12:48

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