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1. Exploratory Data Analysis
1.3. EDA Techniques
1.3.3. Graphical Techniques: Alphabetic Spectral Plot

Spectral Plot: Random Data

Spectral Plot of 200 Normal Random Numbers spectral plot of 200 normal random numbers
Conclusions We can make the following conclusions from the above plot.
  1. There are no dominant peaks.
  2. There is no identifiable pattern in the spectrum.
  3. The data are random.
Discussion For random data, the spectral plot should show no dominant peaks or distinct pattern in the spectrum. For the sample plot above, there are no clearly dominant peaks and the peaks seem to fluctuate at random. This type of appearance of the spectral plot indicates that there are no significant cyclic patterns in the data.
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