The bollinger Band consists of four lines, which are divided into B 1 line, B2 line, B3 line and B4 line. The line B 1 is the exponential (or stock price) resistance line, and the line B4 is the support line. From the width of the bollinger band, we can see the fluctuation range of the index or stock price. When the stock price is consolidating, the four lines contract, which is called convergence. When the stock price breaks up or down, the four lines open, which is called opening positions. When the stock price breaks through the resistance line B 1 upwards, the selling point appears, and when it breaks through the B4 line downwards, the buying point appears. When the stock price rises (falls) along the resistance line (support line), although it has not broken through the support line (pressure line), it has already broken through the B2 line (B3 line), which is also a good selling (buying) point. The calculation of this index is complicated, so I don't need to go into details. Shareholders can be called out from the movement of Qianlong. It should be pointed out that the dynamic bollinger Band has three lines, as shown in the following figure. B2B3 lines are combined into MB lines, which operate in the same way as static trunk lines. The bollinger Band consists of four lines, which are divided into B 1 line, B2 line, B3 line and B4 line. The line B 1 is the exponential (or stock price) resistance line, and the line B4 is the support line. From the width of the bollinger band, we can see the fluctuation range of the index or stock price. When the stock price is consolidating, the four lines contract, which is called convergence. When the stock price breaks up or down, the four lines open, which is called opening positions. When the stock price breaks through the resistance line B 1 upwards, the selling point appears, and when it breaks through the B4 line downwards, the buying point appears. When the stock price rises (falls) along the resistance line (support line), although it has not broken through the support line (pressure line), it has already broken through the B2 line (B3 line), which is also a good selling (buying) point. The calculation of this index is complicated, so I don't need to go into details. Shareholders can be called out from the movement of Qianlong. It should be pointed out that the dynamic Bollinger Band three lines and B2B3 lines are combined into MB lines, and the operation mode is the same as that of static trunk uplift.

Among all the index calculations, the calculation method of BOLL index is the most complicated one, in which the concept of standard deviation in statistics is introduced, which involves the calculation of middle track (MB), upper track (UP) and lower track (DN). In addition, like other indicators, BOLL indicators include daily BOLL indicators, weekly BOLL indicators, monthly BOLL indicators, annual BOLL indicators and minute BOLL indicators. Daily BOLL index and weekly BOLL index are often used in stock market research. Although their calculated values are different, the basic calculation method is the same. Take the daily BOLL index calculation as an example, and the calculation method is as follows:

Calculation formula of daily bell index

Intermediate trajectory =N-day moving average

Upper trajectory = middle trajectory+double standard deviation

Lower trajectory = middle trajectory-double standard deviation