通达信BOLL上下线缩口选股指标公式
N:=20;
BOLL:=MA(CLOSE,N);
UPPER:=BOLL+2*STD(CLOSE,N);
LOWER:=BOLL-2*STD(CLOSE,N);
DD:=UPPER-LOWER;
XG:DD<3;
N:=20;
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