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

Autocorrelation Plot: Sinusoidal Model

Autocorrelation Plot for Sinusoidal Model The following is a sample autocorrelation plot of the LEW.DAT data set.

autocorrelation plot for sinusoidal model

Conclusions We can make the following conclusions from the above plot.
  1. The data come from an underlying sinusoidal model.
Discussion The plot exhibits an alternating sequence of positive and negative spikes. These spikes are not decaying to zero. Such a pattern is the autocorrelation plot signature of a sinusoidal model.
Recommended Next Step The beam deflection case study gives an example of modeling a sinusoidal model.
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