The first chart is the computed seasonal or annual cycle of the Dow Jones based on daily data from 1928 to 2008. The algorithm is proprietary to CSI Data, my data service for decades. Other providers show similar charts.
Cyberfriend and super market analyst Christopher Carolan has another method of analyzing the annual cycle, which is also proprietary but which has a good record for periods when I have seen it.
You can and should always access Chris's new blog from my select blog list way down the left hand border. http://carolan.org/
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