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  • Sci期刊影响因子分析(北京)

    1. 1. 期刊影响因子分析 汤姆森科技信息集团 中国办事处
    2. 2. Journal Citation Reports - Journal impact factor Essential Science Indicators Citation and citation analysis Citation Analysis via Peer Assessment
    3. 3. 50 years ago… <ul><li>Garfield, E. “Citation indexes for science: A new dimension in documentation through association of ideas.” Science , 122 (3159), p.108-111, July 1955. </li></ul>Cited References association of ideas of its author Citation Indexes new approach to subject control of the literature of science
    4. 4. 2004 Cited References 2000 1998 2001 1993 2003 Times Cited 2003 2004 Cited References Paper/Article Citing papers How to define “ citation”?
    5. 5. <ul><li>利用引文分析进行科研评估的理论基础 : Normative Perspective on citations </li></ul><ul><li>美国社会学家罗伯特 · 默顿 (Robert K. Merton): 《科学的规范结构》 </li></ul><ul><li>文献引用的动机 Citation motivation: 原文献的科学价值 </li></ul><ul><ul><li>Citation – Impact, Influence, Importance, Performance </li></ul></ul><ul><li>科学期刊在同行科学家的交流中起着 根本 的作用。即科学文献能够代表科学活动以及表现不同分支学科之间关系。在整个期刊系统中,可以区分出“重要”的国际性期刊 </li></ul><ul><li>学术文献被 重要的 期刊文献 引用的次数是这一文献的影响或国际显著性的一种度量 </li></ul><ul><ul><ul><li>Moed et al., The use of bibliometric data for the measurement of university research performance, Research Policy, 14, 131-149,1985; </li></ul></ul></ul><ul><ul><ul><li>Oppenheim, C. Journal of Documentation, 1995 </li></ul></ul></ul>引文分析的前提
    6. 6. Web of Science® and its offspring Web of Science Journal Citation Reports Journal Impact Factor Stats by journal Stats by address Essential Science Indicators Baselines Customize Research Services Group National Science Indicators Institutional Citation Reports Topic Citation Reports etc…
    7. 7. Web of Science® and its offspring <ul><li>Article-level vs. Journal-level data </li></ul>Science Citation Index Expanded Web of Science Journal Citation Reports Journal Impact Factor Stats by journal
    8. 8. Journal Citation Reports 独特的多学科期刊分析评价工具 <ul><li>自 1997 年以来的数据: </li></ul><ul><li>提供基于引文数据的期刊评价指标 </li></ul><ul><li>显示出引用和被引期刊之间的相互关系 </li></ul><ul><li>帮助用户以定量的方式了解全球的学术期刊 </li></ul>
    9. 9. 利用 JCR on Web 深入了解学术期刊
    10. 13. Calculation of Journal Impact Factor Example: 2004 Impact Factor for New England Journal of Medicine 2002 2003 2004 366 papers published in 2003 14147 times cited in 2004 378 papers published in 2002 14549 times cited in 2004 378+366 14549+14147 = 744 28696 ≒   38.570 Journal Citation Reports 2004 Science Edition Impact Factors only take the recent 3 years into consideration. What about the fields with a longer citation span?
    11. 14. 2004 IF =38.570 The journal impact factor is a measure of the frequency with which the &quot;average article&quot; in a journal has been cited in a particular year. The impact factor will help you evaluate a journal's relative importance, especially when you compare it to others in the same field .
    12. 16. Journal Impact Factor <ul><li>Average citation count in a particular year </li></ul><ul><li>Assigned at “journal level” </li></ul><ul><li>Assigned to journals indexed in Citation Indexes </li></ul><ul><ul><li>SCIE (Science Citation Index Expanded) </li></ul></ul><ul><ul><li>SSCI (Social Sciences Citation Index) </li></ul></ul><ul><li>Included in Journal Citation Reports® database </li></ul><ul><li>Updated annually </li></ul><ul><li>Helpful when evaluating a journal’s relative importance </li></ul><ul><li>Not intended to evaluate individual papers/researchers </li></ul>
    13. 17. Why Impact Factor? <ul><li>Comparison of scholarly journals </li></ul><ul><ul><li>Journal collection development in a library </li></ul></ul><ul><ul><li>Decision-making support for article submission by a researcher </li></ul></ul><ul><ul><li>Editorial policy development by a journal publisher </li></ul></ul><ul><li>Problems in SIMPLE comparison of citation counts </li></ul><ul><ul><li>Size (# of articles published in a year) </li></ul></ul><ul><ul><li>Frequency (# of issues published in a year) </li></ul></ul>Impact Factor: AVERAGE citation count
    14. 18. Web of Science® record example Cited References: Items cited by this article (29 items) Times Cited: How many articles are citing this article (350 articles) Records are counted at journal-level, then included in Journal Citation Reports® Look up journal info in JCR
    15. 19. What you can tell in Journal Citation Reports® <ul><li>Which journals publish most number of articles? </li></ul><ul><li>Which journals are most cited in particular disciplines? </li></ul><ul><li>Which journals have “high impact” in particular disciplines? </li></ul><ul><li>Which journals publish “hot” topics? </li></ul><ul><li>Journal’s self-citations </li></ul><ul><li>Review article rates </li></ul><ul><li>Cited-citing relationships of journals </li></ul>× JCR is not for evaluating individuals/papers
    16. 20. Recognize skewed nature of citation data <ul><li>Citation distributions are not normal (the typical bell-shaped curve) </li></ul><ul><li>Apparent at every level of analysis </li></ul><ul><li>Citation distributions are extremely skewed: few papers or people are cited at high frequency, most cited little </li></ul>67% papers are below the average Web of Science, search conducted on Sept 28, 2005
    17. 21. Misuse of “Impact Factor” I first mentioned the idea of an impact factor in 1955. At that time it did not occur to me that impact would one day become the subject of widespread controversy. …… It has been used constructively to select the best journals for Current Contents ® and the Science Citation Index,® and for library collections. However, it has been misused in many situations, especially in the evaluation of individual researchers . “ The use of JCR and JPI in measuring short and long term journal impact”. Presented by Eugene Garfield at Council of Scientific Editors Annual Meeting held in May 9, 2000.
    18. 22. Essential Science Indicators SM Essential Science Indicators ESI lists the top 1% of scientists and institutions, and the top 50% of countries and journals; also provides benchmarks for evaluating individual papers Counted by scientist, country, institution, journal Web of Science Science Citation Index Expanded Social Sciences Citation Index
    19. 23. Benchmarking data for papers
    20. 24. Benchmarking data for papers
    21. 25. Compare like with like <ul><li>THIS IS THE GOLDEN RULE OF CITATION ANALYSIS </li></ul><ul><li>Always compare “apples with apples, not apples with oranges” </li></ul><ul><li>Field averages are different, by 10:1 </li></ul><ul><li>Time affects citation counts </li></ul>High Impact Papers Database, 1981-2004 ECR is only available in RSG customized data delivery. ECR (Expected Citation Rates) is the average citation count of items that are published in the same journal, in the same year, and as the same document type.
    22. 26. Summary <ul><li>Citation Indexes </li></ul><ul><ul><li>Web of Science® </li></ul></ul><ul><ul><li>Journal selection process </li></ul></ul><ul><li>Impact Factor </li></ul><ul><ul><li>Included in JCR </li></ul></ul><ul><ul><li>Average citation count in a particular year for a journal </li></ul></ul><ul><ul><li>Only account for recent years </li></ul></ul><ul><ul><li>Helpful in evaluating a journal’s relative importance </li></ul></ul><ul><ul><li>Not intended to evaluate individual papers/researchers </li></ul></ul><ul><li>Characteristics of citation data </li></ul><ul><ul><li>Different citation patterns by disciplines </li></ul></ul><ul><ul><li>Skewed distribution </li></ul></ul><ul><li>Benchmarks for research evaluation </li></ul><ul><ul><li>Included in ESI </li></ul></ul><ul><ul><li>Average citation rates </li></ul></ul><ul><ul><li>Percentiles </li></ul></ul><ul><ul><li>Match against with the actual citation counts </li></ul></ul><ul><ul><li>No simplistic ways for research evaluation by citation analysis </li></ul></ul><ul><ul><li>Use citation data to COMPLEMENT peer review process </li></ul></ul>complement Quantitative analysis and peer review complement one another!
    23. 27. Thank you! 谢谢!
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