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I am interested in more information on the p value (proportion of spectrum to keep after high frequencies are removed). Can you point me to a reference or example?
Hello there ;)
The Fourier procedure decomposes your series into a set of clean signals with different frequencies. The lower the p, the lower the number of clean signals allowed in your Fourier process. Low p’s produce flat Fourier smoothing, whereas high p’s will produce a smoothed series that will perfectly match your time series.
When you increase p from 0 to 1, you add clean signals with frequencies from low to high.
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