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> this practice/theory was discovered by doing massive amounts of number
> crunching, the original length and percentages were rounded up to
> where they are now. 21 days and 2.5%
Notice what Mark is doing here. If a sine wave (cycle) has a period of
exactly 21 days, a 21 day simple average will filter it out completely
and the output will be a flat line. So, Mark's 21 day average is
removing the monthly options-related swings, which he considers noise
for this study, and leaving the underlying trend.
--
Dennis
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