组限新探

New Pursuit on Class Limit

阐明了组距式分组中的组限合义,给出了较为完善的组限定义,并结合集合与区间的概念论述了组限的正确表达方式:连续型变量应采用重叠式组限,离散型变量应采用不重叠式组限。重叠式组限中存在实际组限和名义组限的问题,对此,本文提出了确定各组名义值(名义组限)的原则。

The article expounded the implication of class limit in the class interval division into groups, to show clearly a relatively perfect definition on class limit, and expounded correct way of expressing combining the concept of set and interval: continuous variable must take overlapping class limit, dispersed variable must take unoverlapping class limit. The problem about reality class limit and nominal class limit existed in the overlapping class limit. In the field, The article expounded the principle determining nominal values (nominal class limit) of all classes.