Hey, on Monday morning I had a day trading strat reballanced at open pull up Disney as a buy, so I bought it that morning at open because I’d backtested a strategy that uses information at “next open”.
When I look at the backtest over the week, P123, using data from this sample “Rank data as of 10/09/21, Start Date: 10/12/21, End Date: 10/13/21” shows that Disney showed this pricing "1
DIS Walt Disney Co (The) 173.13 173.13 0.00 " Implying that Disney opened at 173.13 and closed at 173.13, and that the backtest would have bought it at 173.13.
I’m super confused, when I bought Disney on Monday as a result of it being the screened stock that morning, it opened at 176, and yahoo finance doesnt record a single at open day as 173.13, the October 12th close is 173.13. the closest open would have been Tuesday’s open at about 173.6.
How would you typically go about following a strategy that’s reballanced daily at open, are you buying the stock that was in your screen yesterday, at today’s open - or would the process be something along the lines of, screen stocks on P123 30 minutes before market open, place at market order for the stock that showed up for the day, and repeat?