
Smoothing Data
2-23
Use the Plotting GUI to display only the data sets of interest. As shown below,
the periodic structure of the ENSO data set becomes apparent when it is
smoothed using a moving average filter with the default span. Not
surprisingly, the uncovered structure is periodic, which suggests that a
reasonable parametric model should include trigonometric functions.
Refer to “General Equation: Fourier Series Fit” on page 3-52 for an example
that fits the ENSO data using a sum of sine and cosine functions.
Display only the data set
created with the moving
average method.
The smoothing process
uncovers obvious periodic
structure in the data.
Commentaires sur ces manuels