DDZ为大单之间的质量差，一般在DDZ呈红色时将预示着短期内将出现放量上攻，当DDZ成绿色时则表明短期出现放量下跌，红色带宽越大，则短期上攻动能越强，绿色带宽越大，则短期杀跌动能越强，可结合其他指南针指标来把握投资机会。
DDZ反映大资金的实力。DDZ的作用在于衡量买卖双方大单的力度，对于大盘股和机构分歧较大的股票比较有效，当然对于多方主力占绝对优势的股票更容易排行靠前。
JJ:=(HIGH+LOW+CLOSE)/3;
QJ0:=VOL/IF(HIGH=LOW,4,HIGH-LOW);
QJ1:=IF(CAPITAL=0,QJ0*(JJ-MIN(CLOSE,OPEN)),QJ0*IF(HIGH=LOW,1,(MIN(OPEN,CLOSE)-LOW)));
QJ2:=IF(CAPITAL=0,QJ0*(MIN(OPEN,CLOSE)-LOW),QJ0*IF(HIGH=LOW,1,(JJ-MIN(CLOSE,OPEN))));
QJ3:=IF(CAPITAL=0,QJ0*(HIGH-MAX(OPEN,CLOSE)),QJ0*IF(HIGH=LOW,1,(HIGH-MAX(OPEN,CLOSE))));
QJ4:=IF(CAPITAL=0,QJ0*(MAX(CLOSE,OPEN)-JJ),QJ0*IF(HIGH=LOW,1,(MAX(CLOSE,OPEN)-JJ)));
QJ5:=QJ1+QJ2;{www.gp66.cn}
QJ6:=QJ3+QJ4;
DD:=(QJ5-QJ6)/(QJ5+QJ6)*100;
DDZ:DD*7,LINETHICK1;
DDZ1:=DD*3,LINETHICK1;
PAINTBAND(DDZ,DDZ1),COLORRED;
PAINTBAND(DDZ1,DDZ),COLORCYAN;
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