The Demand Index was created by James Sibbet. This indicator uses a combination of price and volume data for the purpose of indicating price change. When buying pressure is greater than selling pressure, the Demand index will be above the zero line. Likewise, when selling pressure exceeds buying pressure the Demand Index will be below the zero line.
This is a companion discussion topic for the original entry at https://www.optuma.com/kb/optuma/tools/price/demand-index