The Cumulative Volume Delta (TT CVD Study) displays a running total of net transactions as calculated by Volume Delta. Transactions occurring on the Ask are considered Buying Pressure and are added to the total, and those occurring on the Bid are considered Selling Pressure and are subtracted from the cumulative total.
TT CVD = Cumulative ( Vol Δ )
Vol Δ = Difference between Bid Volume and Ask volume over specified interval
Bid Volume = - ( Accumulated Bid Volume )
Ask Volume = + ( Accumulated Ask Volume )
Buying Pressure = TT CVD > 0
Selling Pressure = TT CVD < 0