This is a special version RSI, in this case , I am using the volume, which is measuring the speed and change of volume to the price both up and down size. Volume RSI attempts to gauge price trend changes via changes in bullish and bearish movements.
Its formula is : VoRSI = 100 - 100 / (1 + VoRS)
where VoRS is Volume Relative Strength over specified period which is calculated as a ratio between averages of Up-Volumes and Down-Volumes:
The logic for this strategy is simple We entry long when we have a crossover with the Overbought level and we entry short when we have a crossunder with oversold level.