一个连续一段时间都收双阴线的选股公式

1、一段时间之内，只要是收阴就收双阴；
2、连续出现双阴次数大于等于三次；

YX:=C>O OR (C=O AND C>=REF(C,1));
 YX1:=C<O OR (C=O AND C<=REF(C,1));
 AA:=YX AND REF(YX1,1) AND REF(YX1,2) AND REF(YX,3);
 T:=BARSLAST(CROSS(AA,0.5));
 TJ1:=(YX AND REF(YX1,1) AND REF(YX,2)) OR BARSLASTCOUNT(YX1)>2;
 B:=(YX AND REF(YX1,1) AND REF(YX,2)) OR BARSLASTCOUNT(YX1)>2;
 T1:=BARSLAST(CROSS(B,0.5));
 COUNT(T=0,T1-1)>=3 AND T=0 AND COUNT(TJ1,T1-1)=0;