Sharpening a Cyclical Shovel

Guest Post by Willis Eschenbach There are a number of lovely folks in this world who know how to use a shovel, but who have never sharpened a shovel. I’m not one of them. I like to keep my tools sharp and to understand their oddities. So I periodically think up and run new tests…

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CEEMD and Sunspots

Guest Post by Willis Eschenbach I’ve been investigating the use of the “complete ensemble empirical mode decomposition” (CEEMD) analysis method, which I discussed in a previous post entitled Noise-Assisted Data Analysis. One of the big insights leading to modern signal analysis was the brilliant idea of Joseph Fourier. He realized that any given waveform can…