The Volume Rate of Change (Volume ROC) is identical to the ROC (Rate of Change) technical indicator that displays the percentage difference between the current Volume and the volume n-time periods ago.
Like the ROC, the Volume ROC is an oscillator that fluctuates above and below the zero line. When the volume increases, the Volume ROC moves up and when the price decreases, the Volume ROC falls. The greater the change in volume, the greater is the change in the Volume ROC.
A high volume ROC indicates volume surges and can be used to define the overbought/oversold moments that can lead to a trend reversal.
It is good practice to scroll backwards on the chart to the recent past (several frames back) to look for connections between Volume ROC, volume surges and the price reversal and try to apply them to the current market.
It is a good idea to use this indicator in conjunction with other price-based technical indicators.
Chart 1: Volume ROC (Rate of Change)
The formula for calculating Volume ROC is
Volume ROC = (Volume - Volume N periods ago) / Volume N periods ago * 100
By Victor Kalitowski for MarketVolume.com