| 韩毅,夏慧.时间因素视角下科研人员评价的Pt指数研究[J].中国图书馆学报,2015,41(6):73~85 |
| 时间因素视角下科研人员评价的Pt指数研究 |
| Pt Indices:Evaluating Researchers Under the Context of Time |
| 投稿时间：2015-06-28 修订日期：2015-07-24 |
| DOI：10.13530/j.cnki.jlis.150033 |
| 中文关键词: 科研人员评价 时间稀释效应 时间凝聚效应 Pt指数 |
| 英文关键词: Researchers evaluation Dilute effect of time Agglomerative effect of time Pt indices |
| 基金项目: |
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| 中文摘要: |
| P指数是在克服h指数缺乏区分度、仅关注h核内元素和操作繁琐等缺陷的基础上发展起来的新型科技评价指标,但不考虑时间因素的P指数,难以克服相同引文量不同引文时间窗文献和老化速度较慢文献的评价误差。本研究在分析时间因素的稀释效应后,构建了评价相同引文量不同引文时间窗文献的Pt1指数,在分析时间因素的凝聚效应后构建了评价老化速度较慢文献的Pt2指数。选择图书情报与文献学领域h指数排名前100位的学者为样本,以CSSCI收录的文献为对象,采集样本对象1998—2013年的发文量和引文量数据,计算样本对象的h指数、P指数、Pt1指数和Pt2指数。结果表明,两个Pt指数是高效的综合质量因素与数量因素的评价指标；相较于h指数,两个Pt指数均具有较高的区分度和灵敏性；相较于P指数,Pt1指数具有识别发文时长较短的潜在高价值文献的能力,Pt2指数具有识别经典高价值文献的能力。 |
| 英文摘要: |
This paper, taking account of the time factor, intends to reconstruct P index, a new scientific and technological evaluation index which could overcome such problems of h index as lack of discrimination, mere focus on core elements and complex operations yet still encountering difficulty, due to its neglect of the time effect, in reducing evaluation errors under the context of evaluating literature with the same citation amounts but different citation time window or slow aging literature. Time, a historical selective factor, is taken as a regulating factor to improve P index owing to its certain selectively filtering function upon the researchers scientific products and the corresponding general classification of the quality levels of researchers scientific products. For the researchers scientific products with different publication age, the publication age at the evaluation point is the dilution factor to its quality factor, namely citation number, which is referred to as dilution effects of the time factor. Consequently, Pt1 index, with the publication age as a regulating factor, is constructed to evaluate the scientific performance of the researchers and to eliminate the cumulative effect of the time factor. For the researcher’s products collection, the citation distribution characteristics of different documents reflect their contribution differences to researchers prestige, and the time for the long time cited literatures is an agglomerative factor to the citation numbers, which is called agglomerative effect of time factor. Pt2 index is thus constructed, with the half life of one discipline as the boundary line to weigh the quality factor of cited literature out of the half life, to evaluate the researchers performance and highlight the contribution rate of high quality literature.
In this research, the top 100 scholars of Library and Information Science in China are sorted by h index as a sample and the data about citing and cited literature are retrieved in the database of Chinese Social Sciences Citation Index （CSSCI) from 1998 to 2013. The half life of about the sample discipline is calculated, based on the BurtonKebler equation, as about 4 years, and the parameter b as about 0.29 based on the exponential model of citation distribution. Citation rate （C/N), weighted Pt1 citation amount, weighted Pt2 citation amount, weighted Pt1 citation rate （CW1/N), weighted Pt2 citation rate（CW2/N), h index, P index, Pt1 index and Pt2 index are all calculated. Also calculated are some correlation coefficients such as between papers number, citations number, citation rate and other indices, weighted Pt1 citations amount, weighted Pt1 citation rate, Pt1 index and other indices, weighted Pt2 citations amount, weighted Pt2 citation rate, Pt1 index and other indices.
It is clarified by the research results that compared with h index, the two Pt indices, with higher discrimination and sensitivity, are effective and comprehensive evaluation index of quality factor and quantity factor; compared with Pindex, Pt1index has the potentiality to identify would be highvalue literature with short publication age, and Pt2 index has the ability to identify classic highvalue literature. There is still much to improve in this paper such as the necessity of the further test of the conclusion out of the one sidedness of the concerned sample discipline and the possibly increasing difficulty of calculation as a result of the modified formula which is more complex than the original one. 9 tabs. 25 refs.
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