This document discusses journal impact factors and citation analysis. It explains that journal impact factors are calculated based on the average number of citations to articles published in a journal in the past two years. The impact factor helps evaluate a journal's relative importance but should not be used to evaluate individual papers or researchers. Citation analysis is complicated by differences in citation patterns between fields and a skewed distribution where a few papers receive many citations while most receive few. Benchmarks provided by tools like Essential Science Indicators can help contextualize research metrics like citations but evaluation requires a holistic approach combining both quantitative and qualitative methods.

1. 期刊影响因子分析 汤姆森科技信息集团 中国办事处

2. Journal Citation Reports - Journal impact factor Essential Science Indicators Citation and citation analysis Citation Analysis via Peer Assessment

4. 2004 Cited References 2000 1998 2001 1993 2003 Times Cited 2003 2004 Cited References Paper/Article Citing papers How to define “ citation”?

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…

9. 利用 JCR on Web 深入了解学术期刊

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?

14. 2004 IF =38.570 The journal impact factor is a measure of the frequency with which the "average article" 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 .

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

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. http://www.garfield.library.upenn.edu/papers/cseimpactfactor05092000.html

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

23. Benchmarking data for papers

24. Benchmarking data for papers

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