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How do you execute your orders in Pair Trading?

Dear All,

My name is Jay and I was doing some research on the pairs trading, but come up with several questions on the executions in real trading.

I have a constraint of my trading and it is an intraday trading limitation.

I have found some pairs that are profitable by using "current price data", a cointegration concept, and mixed other models.

My concern is that the calculated profit is the profit that if all the orders were filled fully with a limit order at the current price.

I have tried to send orders as market orders for the strategy, but the strategy didn't work anymore due to the 4 tick profit loss (Entry Long/Short, Exit Short/Long == 4 tick loss).

My question is how people send orders in pairs trading? Are they sending the market orders to reduce the "Not filled risk"?

Please kindly share your experience and thoughts on this.

Thank you very much.