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1.
《Journal of Informetrics》2022,16(3):101315
In 2021, Clarivate published a new version of the Journal Citation Reports (JCR) including a new indicator. The Journal Citation Indicator (JCI) is a new field-normalized metric at journal-level, which is calculated by averaging the Category Normalized Citation Impact (CNCI) of the journal's articles and reviews published in the preceding three-year period. Unlike the Journal Impact Factor (JIF), it is also calculated for the journals of the Arts & Humanities Citation Index (AHCI) and the Emerging Sources Citation Index (ESCI), which are now included in the JCR. To better understand this new indicator, this article analyses its main statistical characteristics in comparison with the other JCR indicators using all JCR journals and categories. The results highlight the similarities between the JCI and JIF, with a high Pearson correlation (0.853) and a similar distribution. This correlation is also high and homogeneous in the different categories, both for Science and Social Sciences. The JCI is therefore a perfect complement to the JIF, as well as representing an alternative to resolve the well-known problems of the JCR. 相似文献
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An expert ranking of forestry journals was compared with Journal Impact Factors and h-indices computed from the ISI Web of Science and internet-based data. Citations reported by Google Scholar offer an efficient way to rank all journals objectively, in a manner consistent with other indicators. This h-index exhibited a high correlation with the Journal Impact Factor (r = 0.92), but is not confined to journals selected by any particular commercial provider. A ranking of 180 forestry journals is presented, on the basis of this index. 相似文献
4.
This study describes the meaning of and the formula for S-index, which is a novel evaluation index based on the number of citations of each article in a particular journal and the rank of the article according to the number of citations. This study compares S-index with Impact Factor (IF), which is the most well-known evaluation index, using the Korea Citation Index data. It is shown that S-index is positively correlated with the number of articles published in a journal. Tapered h-index (hT-index), which is based on all articles of a journal like S-index, is compared with S-index. It is shown that there is a very strong positive correlation between S-index and hT-index. Although S-index is similar to hT-index, S-index has a slightly better differentiating power and ranks the journal with evenly cited articles higher. 相似文献
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《Library Acquisitions: Practice & Theory #》1998,22(2):147-159
This paper investigates the usefulness of ISI Journal Impact Factors in making serial selection and deselection decisions. It shows that Impact Factors do not remain relatively constant from year to year; specifically, the rank order of 56 ecology titles was found to vary considerably over time. The median year-to-year variation in Impact Factors was found to be 21.9%, and the average variability of Impact Factors over a five-year period was 13.2%. The study also found a considerable degree of overlap in the average Impact Factor of serials in the ISI’s Ecology category. These findings cast doubt on the usefulness of relying on a single year’s JCR (Journal Citation Reports) to make informed selection/deselection decisions. 相似文献
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利用Google的PageRank原理进行期刊引文分析,提出期刊在引文网络中的影响力测度指标--引文网络影响力序位(Journal Impact Rank in Citation Net,Impact Rank或IR).通过对118种生物学领域的期刊进行期刊引文网络影响力测度,并将IR结果与JCR提供的影响因子(Impact Factor, IF)值进行统计学分析以考察二者的相关性和差异性.结果表明,IR值与IF值的相关性较弱,其差异性具有统计学意义.分析其原因,IR考虑了引证期刊的权重和期刊间的相互影响,更适于反映期刊在其相关学科或领域的引文网络中的相对影响力;IF值因其实质上是期刊论文篇均被引频次,其计算不考虑期刊之间的相互联系和引证期刊的权威性,因而更适用于期刊自身的纵向评价;IR与IF从两种不同角度评价期刊影响力,可互为补充. 相似文献
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This paper provides a ranking of 69 marketing journals using a new Hirsch-type index, the hg-index which is the geometric mean of hg. The applicability of this index is tested on data retrieved from Google Scholar on marketing journal articles published between 2003 and 2007. The authors investigate the relationship between the hg-ranking, ranking implied by Thomson Reuters’ Journal Impact Factor for 2008, and rankings in previous citation-based studies of marketing journals. They also test two models of consumption of marketing journals that take into account measures of citing (based on the hg-index), prestige, and reading preference. 相似文献
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《Journal of Informetrics》2022,16(1):101243
We propose WEIG – Wroclaw Effectiveness Indicator for Grants. This new scientometric measure is an aggregated quality measure of scientific papers published with the grant support divided by its budget. Several WEIG variations have been considered with respect to journal quality indicators like Impact Factor (IF), Article Influence Score (AIS), and Average Journal Impact Factor Percentile (IF%). Projects from two public agencies were analysed utilising the WEIG measures: European Research Council (ERC) and National Science Centre, Poland (NSC). The studies revealed that NSC grants are overall more effective than ERC ones, constantly 2–3 times more for Physical Sciences and Engineering (PE). There are four NSC panels distinctively more efficient than their counterparts in ERC: Mathematics (PE1), Fundamental Constituents of Matter (PE2), Computer Science and Informatics (PE6) and Universe Sciences (PE9). The most efficient NSC funding schemes are Etiuda, Preludium, and Harmonia. The higher average effectiveness of programmes aimed at young scientists has been observed: the ERC Starting Grants have greater effectiveness than Advanced Grants. Both agencies manage to keep overall efficiency regardless of increasing their budget over the years. Limitations of the proposed approach to assess project effectiveness, especially for Social Sciences and Humanities, are also discussed. 相似文献
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We use a trading metaphor to study knowledge transfer in the sciences as well as the social sciences. The metaphor comprises four dimensions: (a) Discipline Self-dependence, (b) Knowledge Exports/Imports, (c) Scientific Trading Dynamics, and (d) Scientific Trading Impact. This framework is applied to a dataset of 221 Web of Science subject categories. We find that: (i) the Scientific Trading Impact and Dynamics of materials science and transportation science have increased; (ii) biomedical disciplines, physics, and mathematics are significant knowledge exporters, as is statistics and probability; (iii) in the social sciences, economics, business, psychology, management, and sociology are important knowledge exporters; and (iv) Discipline Self-dependence is associated with specialized domains which have ties to professional practice (e.g., law, ophthalmology, dentistry, oral surgery and medicine, psychology, psychoanalysis, veterinary sciences, and nursing). 相似文献
10.
Borja González-Pereira Vicente P. Guerrero-Bote Félix Moya-Anegón 《Journal of Informetrics》2010,4(3):379-391
A size-independent indicator of journals’ scientific prestige, the SCImago Journal Rank (SJR) indicator, is proposed that ranks scholarly journals based on citation weighting schemes and eigenvector centrality. It is designed for use with complex and heterogeneous citation networks such as Scopus. Its computation method is described, and the results of its implementation on the Scopus 2007 dataset is compared with those of an ad hoc Journal Impact Factor, JIF(3y), both generally and within specific scientific areas. Both the SJR indicator and the JIF distributions were found to fit well to a logarithmic law. While the two metrics were strongly correlated, there were also major changes in rank. In addition, two general characteristics were observed. On the one hand, journals’ scientific influence or prestige as computed by the SJR indicator tended to be concentrated in fewer journals than the quantity of citation measured by JIF(3y). And on the other, the distance between the top-ranked journals and the rest tended to be greater in the SJR ranking than in that of the JIF(3y), while the separation between the middle and lower ranked journals tended to be smaller. 相似文献
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JCR五年期影响因子探析 总被引：6，自引：0，他引：6
使用期刊引证报告(JCR)6015种期刊数据,以统计学方法探索性地分析5年期影响因子IF5的特点.结果显示,IF5作为具有代表性的平均性期刊评价指标,能更好地反映多数期刊被引高峰,总体符合布拉德福分布.IF5与2年期影响因子IF存在排序相关,也有显著统计学差异,两者测评结果在较好和较差期刊上相对一致,但在多数水平居中的期刊上存在区别.最后,给出Ifa指数测度两种影响因子的差别和Ifb指数综合两种影响因子的评价信息. 相似文献
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《Journal of Informetrics》2014,8(2):421-430
Unlike Impact Factors (IF), Article Influence (AI) scores assign greater weight to citations that appear in highly cited journals. The natural sciences tend to have higher citation rates than the social sciences. We might therefore expect that relative to IF, AI overestimates the citation impact of social science journals in subfields that are related to (and presumably cited in) higher-impact natural science disciplines. This study evaluates that assertion through a set of simple and multiple regressions covering seven social science disciplines: anthropology, communication, economics, education, library and information science, psychology, and sociology. Contrary to expectations, AI underestimates 5IF (five-year Impact Factor) for journals in science-related subfields such as scientific communication, science education, scientometrics, biopsychology, and medical sociology. Journals in these subfields have low AI scores relative to their 5IF values. Moreover, the effect of science-related status is considerable—typically 0.60 5IF units or 0.50 SD. This effect is independent of the more general finding that AI scores underestimate 5IF for higher-impact journals. It is also independent of the very modest curvilinearity in the relationship between AI and 5IF. 相似文献
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SJR与影响因子、H指数的比较及SJR的扩展设想 总被引：15，自引：3，他引：12
介绍了SCImago Journal Rank(SJR)及其计算过程,使用因子分析、回归及相关分析等方法实证研究了SJR与期刊影响因子、期刊h指数的关系。结果表明:SJR与期刊影响因子和期刊h指数均有较强正相关性;SJR与期刊影响因子的联合判定可区别出期刊在流行与声望两个维度上的特点;SJR和期刊引文及参考文献的平均性指标具有较强内部关联性,而期刊h指数则与总体性指标内部关联较强。提出了标准化SJR用于解决SJR不能跨学科比较的问题,提出了期刊声望演化指数用于衡量期刊声望的演变趋势,并将SJR的运用范围扩展到了学科和国家层次。 相似文献
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Henk F. Moed 《Journal of Informetrics》2010,4(3):265-277
This paper explores a new indicator of journal citation impact, denoted as source normalized impact per paper (SNIP). It measures a journal's contextual citation impact, taking into account characteristics of its properly defined subject field, especially the frequency at which authors cite other papers in their reference lists, the rapidity of maturing of citation impact, and the extent to which a database used for the assessment covers the field's literature. It further develops Eugene Garfield's notions of a field's ‘citation potential’ defined as the average length of references lists in a field and determining the probability of being cited, and the need in fair performance assessments to correct for differences between subject fields. A journal's subject field is defined as the set of papers citing that journal. SNIP is defined as the ratio of the journal's citation count per paper and the citation potential in its subject field. It aims to allow direct comparison of sources in different subject fields. Citation potential is shown to vary not only between journal subject categories – groupings of journals sharing a research field – or disciplines (e.g., journals in mathematics, engineering and social sciences tend to have lower values than titles in life sciences), but also between journals within the same subject category. For instance, basic journals tend to show higher citation potentials than applied or clinical journals, and journals covering emerging topics higher than periodicals in classical subjects or more general journals. SNIP corrects for such differences. Its strengths and limitations are critically discussed, and suggestions are made for further research. All empirical results are derived from Elsevier's Scopus. 相似文献
15.
Ryan Litsey 《Journal of Interlibrary Loan, Document Delivery & Electronic Reserve》2013,23(1-2):45-46
Abstract Health sciences libraries are expanding services that use online technologies to support teaching, research, and clinical care needs. Saint Louis University's Health Sciences Center (SLU HSC) Library has developed strong, user-centered, online services in interlibrary loan, bibliographic instruction, and electronic reserves. The authors present their successful experiences in using electronic technologies to improve library services. Journal articles are provided, often the same day as requested through interlibrary loan, and delivered in electronic format using OCLC's ILLiad program. First-year SLU medical students now complete a self-paced, all online, Health Information Resources course that targets the most relevant biomedical resources, reduces student study time, and is viewed as a model for the entire curriculum. ERes, the electronic reserves program, allows faculty to provide course materials that are accessible at the convenience of students 24 hours a day. These online programs are examples of using electronic technologies to better support user needs for excellent library services. 相似文献
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AbstractThis column discusses the point-of-care tool Clinical Pharmacology. This review is primarily intended for newer health sciences librarians who are learning about drug references and clinical decision-making support systems or health sciences librarians making collection development decisions, although any librarian will find this review useful. A sample search will be provided to highlight the database’s unique features as well as a comparison to other resources. 相似文献
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《Journal of Informetrics》2007,1(2):170-177
Hirsch's h-index seeks to give a single number that in some sense summarizes an author's research output and its impact. Essentially, the h-index seeks to identify the most productive core of an author's output in terms of most received citations. This most productive set we refer to as the Hirsch core, or h-core. Jin's A-index relates to the average impact, as measured by the average number of citations, of this “most productive” core. In this paper, we investigate both the total productivity of the Hirsch core – what we term the size of the h-core – and the A-index using a previously proposed stochastic model for the publication/citation process, emphasising the importance of the dynamic, or time-dependent, nature of these measures. We also look at the inter-relationships between these measures. Numerical investigations suggest that the A-index is a linear function of time and of the h-index, while the size of the Hirsch core has an approximate square-law relationship with time, and hence also with the A-index and the h-index. 相似文献
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特征因子与影响因子及总被引频次的指标特性比较 ——基于“TOP期刊群”样本的实例分析 总被引：1，自引：0，他引：1
通过特征因子与影响因子及总被引频次的指标比较分析和实例佐证,发现特征因子在跨学科评价方面的优势较突出。对我国的优秀期刊进行特征因子指标分析,得到了与常规影响因子不同的结论:1)我国一流期刊实际的学术影响力远低于国际一流期刊的影响力;2)相对于其他学科,我国物理和化学学科期刊在国际上的学术影响力较大,在影响因子排名处于劣势的我国数学类期刊,在国际上也具有一定的影响力。 相似文献
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Péter Vinkler 《Journal of Informetrics》2012,6(2):254-264
The effect of two different calculation methods for obtaining relative impact indicators is modelled. Science policy considerations make it clear that evaluating the sets of publications, the “ratio of the sums” method should be preferred over the “mean of the ratios” method. Accordingly, determining the relative total impact against the mean relative impact of the publications of teams or institutes may be preferred. The special problem caused by relating the number of citations of an individual article to the Garfield (Impact) Factor (or mean citedness) of the publishing journal (or a set of journals selected as standard) lower than zero is demonstrated by examples. The possible effects of the different share of publications in different fields on the value of the “new crown” index are also modelled. The assessment methods using several appropriately weighted indicators which result in a composite index are recommended. The acronym “BMV” is suggested to term the relative impact indicators (e.g. RCR, CPP/JCSm, CPP/FCSm and RW) in scientometrics. 相似文献
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A. Tyler Nix Jeffrey T. Huber Robert M. Shapiro II Andrea Pfeifle 《Journal of the Medical Library Association》2016,104(2):131-137