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Nov 15, 2019 at 4:34 comment added Richard at NorgateData In various parts of the world, a stock is available to trade on multiple exchanges. The "open" therefore has multiple meanings. On a consolidated tape basis, the open represents the first reported trade. On the primary listing exchange, is often done via an opening auction or driven by a market maker, and they may open the market seconds or minutes later than the opening bell. A similar auction takes place on the closing bell, but this time the primary listing exchange close is the arbiter of the close price (if there's enough liquidity for an auction).
Nov 15, 2019 at 4:28 comment added dynamic89 Sure but if the model is trained using daily closing prices of the stock and I only get a signal by the end of the day (that's when a new data point comes in). Then when I put in an order the market is already closed. I see a lot of papers using daily closing prices instead of opening prices, is there a reason?
Nov 15, 2019 at 4:24 history answered Theodore CC BY-SA 4.0