VPCI finds the relation between price and volume.
Formulas:
VPCI=VPC*VPR*VM, where
VPC=VWMA(Slow_period)-SMA(Slow_period),
VWMA=Sum(Price_close*Volume),
SMA=Sum(Price_close),
VPR=VWMA(Fast_period)/SMA(Fast_period),
VM=(Sum(Volume,Fast_period)*Slow_period)/(Sum(Volume,Slow_period)*Fast_period).
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