Among many technical analysis indexes, BOLL index belongs to a special kind. It is precisely because of the characteristics of flexibility, intuition and trend that BOLL index has gradually become a popular index widely used by investors in the market.
Boll index is used in stock market analysis software. The BOLL indicator consists of four lines, namely, the upper rail line UP, the middle rail line MB, the lower rail line DN and the price line.
Boll index stock selection formula: n: = 20; MIDA:= horse (c, n); VART 1:=POW((MIDA)，2)； VART2:=MA(VART 1，N)； var T3:= SQRT(var T2)； UPPERA:= MIDA+2 * var T3； LOWERA:= MIDA-2 * var T3； BOLL:=REF(MIDA， 1)； UB:=REF(UPPERA， 1)； LB:=REF(LOWERA， 1)； T 1:=EXIST(CROSS(C，UB)，2)& amp； & ampLAST(C>UB， 1，0)； T2: Cross (MACD. MACD DIF。 DEA)， 1)； ; & amp； MACD。 DEA > 0； t:t 1 & amp； ; & amp； T2 .
Boll index is one of the commonly used tools for technical analysis of stock market. By calculating the "standard deviation" of stock price, we can find the "trust interval" of stock price.
The indicator has drawn three lines on the map, in which the upper and lower lines can be regarded as the pressure line and the support line of the stock price respectively, and there is an average line of the stock price between the two lines, and the parameter of the Bollinger Band indicator is preferably set to 20. Generally speaking, the stock price will run in the channel formed by the pressure line and the support line.
Like MACD, RSI, KDJ and other indicators, BOLL indicator is also the most practical technical analysis reference indicator in the stock market.
It consists of four lines, namely 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 is three lines, as shown in the figure "Dynamic Bollinger Band". B2B3 lines are combined into MB lines, which operate in the same way as static trunk lines.