Actually you have it back wards. For the CMF to register false positive in a declining price. You need several end of days high, to effect the calculation, event though the trades all day were low. The tail should be below.
Basically someone buys the daily price swing up at the end of the day. So retail will not give up hoping for a come back. This daily finish high, causes the formula to skew positive. Event though each day, the price may be trading lower then the day before. As long as the day finishes high for the day. The CMF will indicate a positive pressure.
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