Calculation :
The Volume Oscillator can display the difference between the two moving averages as either points or percentages. To see the difference in points, subtract the longer-term moving average of volume from the shorter-term moving average of volume:
To display the difference between the moving averages in percentages, divide the difference between the two moving averages by the shorter-term moving average:

Example :
The following chart shows Xerox and 5/10-week Volume Oscillator.





