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Every match that hits the tape from the perspective of displayed ECNs is a market order matched with a limit order. You can think of this in terms of makers and takers. If I want to buy MSFT at 51.00 and post a limit for that price 3 microseconds before you post your limit to sell at 51.00 then I am the maker and you are the taker. And your sell order will ...


If memory serves correctly, the cran package "orderbook" was for NYSE's TAQ (Transactions and Quotes) database. the limit order book is the aggregation of latent demand in the market. For you to construct the limit order book you face a few (!) challenges. 1) Parsing itch raw messages (casting in the case of version 5.0) and 2) constructing the actual ...

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