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| Applicability and Improvement of the z-index to Evaluate Academic Journals |
| Yu Liping1,2, Wang Zuogong2 |
1. School of Management Engineering and E-commerce, Zhejiang Gongshang University, Hangzhou 310018;
2. School of Economics and Finance, Guizhou University of Finance and Economics, Guiyang 550025 |
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Abstract 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.
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Received: 24 January 2018
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