Hi, I'm reading an article about seasonal influences on prices and I'm trying to see if I can build a seasonal indicator which examines past prices and displays a curve with the seasonal tendencies. I think Larry Williams also uses a similar indicator. The article I'm reading just shows the charts, but doesn't say anything about the formulas/techniques used to construct this. Can someone point me to some place where I can find information on how to construct this kinf of indicator? Which approach should I use, etc. thanks
