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！
编写要求：
成交量三天阴线缩量，第四天成交量缩量阳线的公式。
公式网解答：
REF(EVERY(C<O AND V<REF(V,1),3),1) AND V<REF(V,1) AND C>O;
以下是通达信/同花顺适用的成交量三连阴缩量后第四天缩量阳线选股公式：
//基础条件
COND1:=EVERY(C<O,3); //连续三天阴线
COND2:=EVERY(V<REF(V,1),3); //连续三天缩量
COND3:=C>O AND V<REF(V,1); //第四天阳线且缩量
//增强条件（可选）
FILTER1:=NOT(NAMELIKE('ST')); //排除ST股
FILTER2:=C>MA(C,20); //股价在20日均线上
FILTER3:=MA(C,5)>MA(C,10); //5日均线在10日均线上
//最终选股
XG:COND1 AND COND2 AND COND3 AND FILTER1;该公式通过EVERY函数确认连续三天阴线且成交量递减，第四天出现缩量阳线时触发信号。增强条件可过滤ST股并确认趋势强度。实际应用中建议结合MACD或KDJ指标增强准确性。
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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