股票中布林线设置多少比较合适？

A := REF(CLOSE,1);

X:=SMA(MAX(CLOSE-A,0),3,1)/SMA(ABS(CLOSE-A),3,1)*100;

Y:=SMA(MAX(CLOSE-A,0),5,1)/SMA(ABS(CLOSE-A),5,1)*100;

Z:=SMA(MAX(CLOSE-A,0),8,1)/SMA(ABS(CLOSE-A),8,1)*100;

ABC:=0.5*X+0.31*Y+0.19*Z;

X1:=SMA(100*(CLOSE-LLV(LOW,8))/(HHV(HIGH,8)-LLV(LOW,8)),3,1);

Y2:=SMA(100*(CLOSE-LLV(LOW,8))/(HHV(HIGH,8)-LLV(LOW,8)),5,1);

Z3:=SMA(100*(CLOSE-LLV(LOW,8))/(HHV(HIGH,8)-LLV(LOW,8)),8,1);

XYZ:=0.5*X1+0.31*Y2+0.19*Z3;

MACD:(0.5*ABC+0.5*XYZ );

绝:=(CLOSE-LLV(LOW,10))/(HHV(HIGH,10)-LLV(LOW,10))*100;

顶:=SMA(绝,3,1);

波: MA(MACD,2),COLORRED;

段:SMA(顶,3,1);

DRAWICON(CROSS(波,段),段,15);

CD2:=IF(MACD<20 AND LOW>=REF(LOW,1) AND CLOSE>LOW ,1,0);

CD3:=IF(REF(MACD,1)<20 AND MACD>REF(MACD,1),1,0);

DRAWICON(X,70,15);

VAR31:=REF((LOW+OPEN+CLOSE+HIGH)/4,1);

VAR32:=SMA(ABS(LOW-VAR31),13,1)/SMA(MAX(LOW-VAR31,0),10,1);

VAR33:=EMA(VAR32,10);

VAR34:=LLV(LOW,33);

VAR35:=EMA(IF(LOW<=VAR34,VAR33,0),3);

主力进场:=VAR35>REF(VAR35,1);

STICKLINE(主力进场,85,105,5,0),COLORCYAN;

CS:=(CLOSE-LLV(LOW,8))/(HHV(HIGH,8)-LLV(LOW,8))*100;

主力线:=(EMA(CS,3)-50)*2;

DRAWICON(CROSS(主力线,-80),60,15) ;

VAR1:=(CLOSE-LLV(LOW,80))/(HHV(HIGH,80)-LLV(LOW,80))*200;

VAR2:=SMA(VAR1,3,1);

VAR3:=SMA(VAR2,3,1);

VAR4:=3*VAR2-2*VAR3;