利用ΔR(n)/Δn界定核心区域的探讨

被引：3

作者：

何荣利

机构：

[1] 沈阳农业大学图书馆辽宁

来源：

情报理论与实践 | 2003年 / 05期

关键词：

journal evaluation; mathematical analysis; theoretical study;

D O I：

10.16353/j.cnki.1000-7490.2003.05.011

中图分类号：

G353 [情报资料的处理];

学科分类号：

1205 ;

摘要：

Based on R(n)-n curve,this article makes a deep analysis of ΔR(n)/Δn from the mathematical,geometrical and actual meanings.The change of ΔR(n)/Δn indicates that there is a clear convergence and dispersion in the actual distribution of the documents of the journals.The area in which ΔR(n)/Δn changes greatly is the core area,the area in which ΔR(n)/Δn changes continuously is the dispersive area,and the point at which the variance of ΔR(n)/Δn is bigger than 1 for the two adjacent journals may be taken as the boundary line between the core area and the non core area.

引用

页码：421 / 423

页数：3