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This isn't true....and it's a function of your data fed (IQFeed, Rithmic, CQG, etc,)
The problem is: most data feeds won't retain Bid/Ask data in their historical database.
You can plot it in realtime, but the history is lost when the chart is closed.
// Volume Delta: Calculates the Delta for each Bar
// Value1 returns a positive number for Net Upticks, or negative number for Net Downticks.
Value1 = Upticks-Downticks;
// Cumulative Volume Delta: Value2 provides a cumulative total of all Value1s
Value2{Cum Up/Dn Delta} = cum (value1);
If Plot_Zero_Line then plot6(0,"Zero");
If Plot_Cum_Vol_Delta then Plot16(Value2, "CumVolDelta");
