Sidebar: What is a Fast Fourier Transform? by Thom Hartle
WHAT IS A FAST FOURIER TRANSFORM?
There is an intuitive appeal in the concept that cycles are
apparent in price data. The cycles do not appear to be
consistent, but more of a combination that are longer- and
shorter-term cycles added together. This creates a market
of upward movements with countertrend declines and
downward movements with countertrend rallies.