股价突破BOLL上轨缩量回调到中轨的选股公式

选股条件：

编写源码：

n:=26;

P:=2;

KMA:=MA(CLOSE,1);

MID:=MA(CLOSE,N);

UPPER:=MID+P*STD(CLOSE,N);

LOWER:=MID-P*STD(CLOSE,N);

ta:=barslast(cross(c,upper));

tv:=ref(v,ta);

cross(mid,l) and c>mid and every(v<tv or v<ref(v,1),ta-1) and ta>1;