b值小于0.6为很好的买点，股票可能在此筑底 可耐心持有

参数：N1=125，N2=5，N3=20

aa:=COUNT(C>=REF(C,1),N1)/COUNT(C<REF(C,1),N1);

b:MA(aa,N2);

d:MA(aa,N3)