The Volume Price Confirmation Indicator, or VPCI, is used to measure the relationship between the prevailing price trend and volume. It can be used to either confirm the price trend or contradict the current price trend. When the VPCI is positive, there is a price trend confirmation; when the VPCI is negative there is price trend contradiction.
This is a companion discussion topic for the original entry at https://www.optuma.com/kb/optuma/tools/volume/volume-price-confirmation-indicator