BBI = (3 days average price + 6 days average price + 12 days average price + 24 days average price) ÷ 4
When the stock price is above the BBI indicator line, it indicates that the stock price is in a long market, and when the stock price is below the BBI indicator line, it indicates that the stock price is in a short market. When the stock price breaks through to the BBI, it is time for the market to switch between short and long.