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以下是通达信选股指标 老鸭头源码（无源码的请下载附件导入）
通达信老鸭头选股指标
MA5 := MA(CLOSE,5);
MA10 := MA(CLOSE,10);
MA60 := MA(CLOSE,60);
PDAY1 := BARSLAST(CROSS(MA5,MA60));{5日均线上穿60日均线}
PDAY2 := BARSLAST(CROSS(MA10,MA60));{10日均线上穿60日均线，至此形成鸭颈部}
PDAY3 := BARSLAST(HIGH=HHV(HIGH,PDAY2));{形成头部，要下跌}
PDAY4 := BARSLAST(CROSS(MA10,MA5));{下跌后，5日均线和10日均线死叉}
PDAY5 := BARSLAST(CROSS(MA5,MA10));{回落不久，5日均线和10日均线形成金叉，形成嘴部}
A1:= PDAY1>PDAY2 AND PDAY2>PDAY3 AND PDAY3>PDAY4 AND PDAY4>PDAY5 AND PDAY5<5;
A2:= COUNT(CROSS(MA10,MA5),PDAY2)=1;
A1 AND A2;
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