The buy filter (20 day EMA below the 250 day EMA) sets a special requirement for the CCI. THE CCI MUST FALL BELOW -240 first. The actual buy signal isn't triggered until the CCI rises above -100.
The same principle applies to the sell filter. The basic concept is this - don't trade against the trend unless the market goes to to unusually excessive levels, then wait for momentum to reverse.
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