主图: 中轨,公式:MIDLINE^^MA((H + L + C)/3,LENGTH1); 上轨,公式:UPBAND^^MIDLINE + N*ATR; 下轨,公式:DOWNBAND^^MIDLINE - N*ATR;
副图: 波动率,公式:ATR:=MA(TR,LENGTH2);
(*backtest
start: 2018-07-01 00:00:00
end: 2018-09-17 00:00:00
period: 1h
exchanges: [{"eid":"Futures_CTP","currency":"FUTURES"}]
args: [["LENGTH2",30],["LENGTH1",100],["ContractType","rb888",126961]]
*)
TR:=MAX(MAX((H-L),ABS(REF(C,1)-H)),ABS(REF(C,1)-L));
ATR:=MA(TR,LENGTH2);
MIDLINE^^MA((H + L + C)/3,LENGTH1);
UPBAND^^MIDLINE + N*ATR;
DOWNBAND^^MIDLINE - N*ATR;
BKVOL=0 AND C>=UPBAND AND REF(C,1)<REF(UPBAND,1),BPK;
SKVOL=0 AND C<=DOWNBAND AND REF(C,1)>REF(DOWNBAND,1),SPK;
BKVOL>0 AND C<=MIDLINE,SP(BKVOL);
SKVOL>0 AND C>=MIDLINE,BP(SKVOL);
AUTOFILTER;