z指数评价学术期刊的适用性及其改进研究

Applicability and Improvement of the z-index to Evaluate Academic Journals

z指数是从数量、质量、一致性角度进行评价的复合文献计量指标,分析其特点以及在期刊评价中的适用性具有重要意义。本文在分析z指数原理的基础上,基于图书馆情报与文献学CSSCI期刊,采用相关系数与偏最小二乘法回归对其特点进行分析。研究发现,z指数并不适合进行学术期刊评价,不能很好地体现质量与一致性视角,主要原因是被引集中度难以控制。本文提出采用低被引论文比的倒数代替被引集中度进行修正,并将其命名为zn指数。进一步的研究表明,zn指数克服了z指数的不足,评价效果较好;z指数在推广应用时要慎重进行选择;乘法合成类的复合指数往往灵敏度较高。本文提供了一种检验复合指数的研究范式。

The z-index is a composite bibliometric indicator that is evaluated based on quantity,quality,and consistency.An analysis of its characteristics and applicability to periodical evaluation is of great significance.Based on an analysis of the principles of the z-index and the CSSCI journals of Library and Information Sciences,this paper uses correlation coefficient and partial least square regression to analyze the characteristics of the z-index.It was found that the z-index is not suitable for the evaluation of an academic journal and cannot adequately reflect a perspective of quality and consistency,primarily because the concentration of works cited is too difficult to control.This paper proposed using the inverse of the low cited paper ratio instead of the cited concentration and named it the zn-index.Further research shows that the zn-index comprehensively enhances the z-index and has an improved effect on the evaluation.Moreover,the z-index should be selected carefully.Subsequently,the composite index of multiplication tends to have higher sensitivity.In conclusion,this paper provides a research paradigm for testing composite indexes.