温馨提醒，技术指标有其本身局限性，一旦不符合预期，立即清仓控制风险。指标仅供参考与学习，请勿商用或实战，否则后果和损失自行承担！
编写条件：
昨日成交量是前日1倍以上，今日成交量是昨日50%以下的选股公式。
编写方法：
XG:REF(V,1)>REF(V,2)*2 AND V<REF(V,1)/2;
以下是适用于通达信/同花顺等软件的选股公式代码，用于筛选昨日成交量较前日翻倍且今日成交量萎缩至昨日50%以下的股票：
XG:REF(V,1)>REF(V,2)*2 AND V<REF(V,1)*0.5;该公式通过REF函数引用历史成交量数据，严格满足三个条件：1)昨日成交量(V,1)超过前日(V,2)两倍；2)今日成交量(V)不足昨日一半。
增强版可添加以下条件：
- 排除ST股及停牌股票：
FILTER:=NOT(NAMELIKE('ST')) AND DYNAINFO(17)>0;- 要求今日收盘价高于开盘价：
COND2:=C>O;- 结合5日均量线确认趋势：
COND3:=V<MA(V,5);
网页唯一标识识别码
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指标使用通用经验总结
- 一般出现信号不急着立即介入，介入时机一般尾盘半小时判断信号是否可介入；
- 指标信号出现后第二天冲高阴线，立即清仓，等待突破上一个信号点最高价判断是是否介入；
- 指标信号出现后第二天阴线或假阳线，立即清仓，等待突破上一个信号点最高价在判断是否介入；
- 在上涨，现价处于上涨高位的『介入、看多』信号不参与；
- 不是信号一出现就介入，要根据市场环境，量价关系，市场情绪等诸多因素判断是否可介入；
- 技术指标有其本身局限性，宁可错过，也不要做错；
- 拿到指标后，多测试，多练习，看是否符合预期，总结规律；
总之一旦信号失真，不符合预期，立即清仓控制风险 ；
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