The Price Volume Trend (PVT) is similar to the On Balance Volume (OBV). The OBV
is a cumulative total of volume times +1/-1 based on whether the close is greater
or less than the previous close. However, the PVT is a cumulative total of volume
times the percentage change of the close from the previous close. So, it adds more
of the volume to the total when the price makes greater moves. The PVT is interpreted
in the same ways as the OBV.
See also On Balance Volume.