Program 81 uses a time and sales provider to analyze trade information and plot the number of trades, asks, and bids per bar. The number of trades and bids are plotted as positive numbers, the number of asks as a negative number. Time and Sales data is not available historically in TradeStation so program 81 stores and retrieves calculated values to and from a text file on the user's hard drive using Streamwriter and Streamreader (the name and location of the file being defined by a user input).
https://markplex.com/easylanguage-programs/program-81-frequency-of-trades-bids-and-asks/
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