选股公式，bias形态选股，该怎么写，自学几天选出来效果不好，万分致谢

N1:=6;N2:=12;N3:=24;
BIAS1:=(CLOSE-MA(CLOSE,N1))/MA(CLOSE,N1)*100;
BIAS2:=(CLOSE-MA(CLOSE,N2))/MA(CLOSE,N2)*100;
BIAS3:=(CLOSE-MA(CLOSE,N3))/MA(CLOSE,N3)*100;
REF(BIAS1,1)>BIAS1 AND REF(BIAS2,1)>BIAS2 AND (BIAS1-REF(BIAS1,1))/REF(BIAS1,1)<0.005 AND BIAS3>MAX(BIAS1,BIAS2) AND (BIAS3-MAX(BIAS1,BIAS2))/MAX(BIAS1,BIAS2)>1.05 AND (BIAS2-BIAS1)/MAX(BIAS1,BIAS2)<1 ;