BOLL－布林带
说明
布林线利用统计学原理标准差求取其信赖区间，本指标相较 Envelopes，更能随机调整其变异性，上 下限之范围不被固定，随股价之变动而变动。
应用
1. 股价向上穿越支撑线，买入信号
2. 股价向上穿越阻力线，卖出信号
BOLL使用技巧
1. BOLL 收口：轨道由宽变窄做收敛状，表明行情即将发生突破（上下均有可能），当引起 警觉。
2. 收盘价跌破下轨：表明支撑强劲，有产生反弹的可能，在相应下轨之上可择机考虑买入。
3. 收盘价涨过上轨：表明压力强劲，有产生回档的可能，在相应上轨之下可顺势抛出。
4. 收盘价涨过中轨：此时一旦在中轨处感到压力并疲软，则中轨处于压力带，卖出信号。
5. 收盘价跌破中轨：此时一旦在中轨处受到支撑并坚挺，则中轨亦为支撑带，买入信号。
参数说明
BOLL 线天数参数－默认值：20；P 设定 BOLL
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