When calculating a "tick chart" does one just select a number, e.g., 89, and aggregate 89 trades to define a bar, or is there some sort of calculation including volume? That is, if I get three trades from my data feed going through (assume ES contract) as follows: Trade# Price Volume(contracts) 1 1420.25 10 2 1420.25 1 3 1425.50 3 Would this is considered "3" ticks or "14" ticks? Or do people use some other calculation? Thanks!