There are some technical analysis folks who do a Fourier Transform analysis on a chart. What this does is take a chart that looks like nothing but garbage (like the chart of an earthquake) and makes is look like a sine wave. Now tht you have a simple chart where you can see how many days are in a cycle you can make decisions on what moving averages to use. So if some stock or exchange has a 52 week cycle they the cross over point would be 26 weeks. BTW that is how they simulate earthquakes for designing buildings. Keep in mind that I have forgot most of what I ever knew about TA. But I got an "A" in Fourier Analysis.