Multi-party: refers to many parties, that is, people who actively buy stocks. Empty: refers to the empty side, that is, the person who actively sells stocks. Long-short game: this is a multi-party and empty party, you buy and I sell, fighting each other. Generally speaking, large investors who hold large or short positions now hold large or short positions in stock index futures. In the stock market, bears will try their best to lower the selling price and profit from the empty stock index futures.

The full English name of 1. long and short index is "BullandBearIndex", abbreviated as BBI. It is a comprehensive index after weighted average of different moving averages and belongs to the moving average index. When using EMA, investors often have different preferences for the choice of parameter values, and long and short indicators just solve the rationality problem of short-term EMA. For a long time, due to the lack of a * * * identification rule, the theoretical circle has been arguing about how many days the short-term moving average is reasonable, and the long-short index solves this problem by weighting several moving averages with different days. Generally, four average stock prices (or indices) on 3rd, 6th,12nd and 24th are used as calculation parameters.

2. The calculation formula of the long-short index is: BBI=(3-day average price +6-day average price+12-day average price +24-day average price) ÷4, from which it can be seen that the values of the long-short index contain some weights of the moving averages on different days, and are the values for re-averaging the moving averages on different days, thus representing the "interests" of each moving average respectively. In fact, the long-short index is a special product of the moving average principle, which plays the role of a long-short watershed.

3. When the typical moving average crossing method and multiple moving average crossing method are used to determine the timing of stock trading, if the parameters of the moving semi-moving average are small. If the cycle is too short, the EMA and K-line chart will often cross, and the typical moving semi-EMA cross method and multiple EMA cross method will provide more frequent stock trading signals. Investors will operate according to this, which will increase the trading risk and reduce the trading profit. If the EMA is too effective and the cycle is too long, investors will avoid the risks brought by intraday trading, but the return on investment will decrease with the passage of time. Therefore, it is necessary to solve the influence of the parameters of the moving average on the investment income. The long and short index (BBI) is the best way to solve this problem.