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在学术期刊的计量评价指标体系中,影响因子和总被引频次是2项最为重要的指标,占据了较高的权重;但是,期刊办刊历史长短、发表论文多少、出版周期长短、学科人群多少等都会影响总被引频次的大小。尤其是一些发表大量低水平论文的期刊,依靠论文数量众多,依然可以获得较高的总被引频次;但其影响因子却很低,论文质量很差。如何客观甄别这类论文数量巨大而质量效益不高的期刊?本文提出一个全新的衡量期刊量效关系的指标——期刊量效指数(journal mass index,JMI)。“量”指期刊的发文量,“效”则引入期刊影响因子。JMI定义为某刊影响因子与该刊影响因子对应的发文量的比值,意义是平均每篇文献对该刊影响因子的贡献值。JMI能客观反映同一个学科中量大质低的期刊的“臃肿程度”。在《中国学术期刊影响因子年报(2016版)》中,JMI被应用于修正期刊影响力指数(CI)排序,使CI排序更准确地反映学术期刊的学科影响力排名。实践证明,JMI是一个对学术期刊量效关系进行客观评判的有用的计量指标。
In the metrological evaluation index system of academic journals, the influence factors and the total cited frequency are the two most important indicators, which occupy a higher weight; however, the length of journals, the number of published papers, the length of the publication period, How much will affect the total size of the cited frequency. In particular, some journals that publish a large number of low-level dissertations can still obtain higher total citation frequency depending on the large number of papers. However, their impact factors are very low and their quality is poor. How to objectively identify journals with huge quantity and low quality? The paper proposes a brand new journal mass index (JMI), a measure of the relationship between the quantity and efficiency of journals. “Quantity ” refers to the number of journal papers, “effect ” is the introduction of journal impact factor. JMI is defined as the ratio of an influential factor of a journal to the published corpus corresponding to the influential factor of the journal, in the mean, the contribution of each literature to the influential factor of the journal. JMI can objectively reflect the “bloatedness” of journals with large and low quality in the same discipline. In the 2016 Annual Report on Impact Factors of Chinese Academic Journals, JMI was applied to revise the rankings of CI Impact Index to make CI ranking more accurately reflect the subject rankings of academic journals. Practice has proved that JMI is a useful measure of objective evaluation of the relationship between academic journals.