QAP is unique in that it can not only be applied to the regression of one relational variable on another relational variable but also to correlations among relational and attribute variables.

• QAP不但可以测量两种关系数据之间的回归，还可以测量相关，测量“属性数据”和“关系数据”之间的关系，该方法因而独具特色。