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Web of Science AMC Graduate School 2012-2013


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Web of Science AMC Graduate School 2012-2013

  1. 1. Web of Science Joost Daams, MA Arnold Leenders Ingeborg Nagel, MScMedical Library
  2. 2. Programme• Introduction to Citation Analysis and Web of Science• Web of Science (WoS) – Searching for articles – Cited reference search – Analyzing results• Hirsch-index (H-index)• Journal Citation Reports (JCR): impact factors Medical Library
  3. 3. Introduction: What is a citation index? • A citation index is an index of citations between publications, allowing the user to easily establish which later documents cite which earlier documents1.• First citation index was the Science Citation Index, established in 1960 by the Institute for Scientific Information (ISI). Later followed by the Social Sciences Citation Index and the Arts and Humanitites Citation Index.• Examples of citation indexes: Web of Science, Scopus, CiteSeer, Google Scholar. 1 "Citation index," in Wikipedia; available from Medical Library
  4. 4. Time Cited articles Citing articles 1950 2010 original work2000 2002 2007 2012 1997 2006 2008 1962 2007 2012 Related articles 1998 2001 Medical Library
  5. 5. Introduction: citation analysisUse citation analysis to find:• Who has cited your work• Most cited articles on your research topic• Leading researchers, institutions and journals in your field of research Medical Library
  6. 6. Introduction: Web of Science content (1)• Combination of 3 citation databases: – Science Citation Index – Social Sciences Citation Index – Arts & Humanities Citation Index• Over 12,000 journals and 120,000 conference proceedings indexed, coverage to 1975.• Citation analysis tool Medical Library
  7. 7. Introduction: Web of Science content (2)• Multidisciplinary • Medicine and• 12000 journals related fields• No controlled vocabulary • 5400 journals• Conference proceedings • MeSH terms• Citation analysis • Clinical filters Medical Library
  8. 8. Introduction: recap • Citation analysis • Web of Science: contentMedical Library
  9. 9. WoS: Searching for articles (1)• Combine search terms using operators: – AND, OR, NOT – NEAR/x (x = number of words that separate terms) – SAME (terms in same field, can only be used in Address field)• Topic field = Title, Abstract, Author Keywords• Combine search sets on the Search History page Medical Library
  10. 10. WoS: Searching for articles (2)• Phrase search: "kidney transplant"• Both right- and left-hand truncation: – transplant* finds transplant, transplants, transplantation – *saccharide finds disaccharide, polysaccharide, etc.• Lemmatization (on/off) includes synonyms, plurals, and singulars in the search results. Does not apply for terms enclosed in quotation marks (" "). Medical Library
  11. 11. WoS: Searching for articles (3)• Find articles on Fabry disease• Sort articles by time cited• Which article has been cited most and how many times was this article cited? Medical Library
  12. 12. WoS: Searching for articles (4)Assignment 1.Searching for articles on a topicGo to the Web of Science database and search for articles on the topic delirium in patients with hip fracture.Sort the results by "Times Cited – highest to lowest".a. Which article has been cited most and how many articles have cited this article?b. Click on the Times Cited number to view all articles that cited the selected article. What is the title of the most recent articles that cited it? Medical Library
  13. 13. Cited reference search (1)Medical Library
  14. 14. Cited reference search (2)Assignment 2.Cited reference searchGo to the Cited Reference Search tab in Web of Science and search for the following article, using the predefined fields Cited Author, Cited Work and Cited Year.a. How many additional citing articles do you find for this article by using the Cited Reference Search option?b. Why were these articles not recognized as being citing articles by the Web of Science? Medical Library
  15. 15. Additional: create a citation alert When you create a citation alert, you are notified by e-mail whenever the document has been cited by a new publication. The alert is active for one year. You may renew the alert at any time.
  16. 16. WoS: Analyzing results (1)• Who is the leading author or institution in your field of research?• In which journal should you publish?• How has research on a topic developed over time?• Analyze references by:o Authoro Organizationo Countryo Journal titleo Publication year Medical Library
  17. 17. WoS: Analyzing results (2) A Citation Map shows the citation relationships (cited references and citing articles) between a selected paper and other papers.Medical Library
  18. 18. WoS: Analyzing results (3)Medical Library
  19. 19. WoS: Analyzing results (4)Assignment 3.Analyzing resultsGo to the Search History tab in Web of Science to return to the results from exercise 1. Analyze the results to find:a. Which author had published most articles on delirium after hip fracture.b. Which journal (Source Title) has published most articles on this topic.c. Which country is leading in this field of research. Medical Library
  20. 20. H-index (1)A scientist has index h if h of his/her Nppapers have at least h citations each, andthe other (Np − h) papers have no morethan h citations each.(Hirsch JE: An index to quantify an individuals scientific research output. ProcNatl Acad Sci U S A 2005;102:16569-16572.)Medical Library
  21. 21. Web of Science: recap • Searching for articles • Cited reference search • Analyzing resultsMedical Library
  22. 22. H-index (2)The h-index (Hirsch-index) is an index that attemptsto measure both the productivity and impact of thepublished work of a scientist or scholar.The index is based on the set of the scientists mostcited papers and the number of citations that theyhave received in other publicationsIn the AMC the h-index is one of the factors used forthe scientific evaluation of the Principal Investigators Medical Library
  23. 23. a: n publications c: n citations h: h-indexc h h a Medical Library
  24. 24. H-index : 4 10c 5 h h 0 5 10 15 a Medical Library
  25. 25. h-index : 4 h-index : 4 10c 5 h h 0 5 10 15 a Medical Library
  26. 26. H-index (3)Important:Articles n a>h are of no interest for calculatingthe h-index! Medical Library
  27. 27. H-index (4)How to calculate the h-index:• In the AMC: use the Web of Science• Two ways to calculate – Author search – Search option using the author index Medical Library
  28. 28. Calculate the hirsch-index ofmrs. A.H. TeeuwGeneral paediatricianEmmakinderziekenhuisAmsterdam Medical Library
  29. 29. H-index (5)Problems:• Spelling of the authors name differs (initials)• Different authors have the same name• Unknown where the author has worked (even for the author)• Faulty citations Medical Library
  30. 30. H-index (6)Assignment 4.Calculate the Hirsch-Index of the scientists:a. Tabbers M; paediatric gastroenterologist AMCb. Your promotor Medical Library
  31. 31. JCR – Impact Factors (1)• What it is … JIF2011 = A/B A = the number of times articles published in 2009 and 2010 were cited  by indexed journals during 2011. B = the total number of "citable items" published by that journal in 2009  and 2010. ("Citable items" are usually articles, reviews, proceedings, or  notes; not editorials or Letters-to-the-Editor.)• Application evaluate research performance job promotion make decisions on funding evaluate journal collections determine publication strategy Medical Library
  32. 32. H-index: recap • What it’s for • What it is • How to calculateMedical Library
  33. 33. JCR – Impact Factors (2)• Critique Temporality bias Geographical/language bias Topicality bias Incentive for self-citations Range of provided subject topics Assignment of journals to topics Poor adaptation of web downloads / web citations Non-transparent journal inclusion criteria by  Thomson Reuters Monolithic organisation•  Strengths “ Impact factor is not a perfect tool to measure the quality of articles but there is nothing   better and it has the advantage of already being in existence and is, therefore, a good    technique for scientific evaluation.   (…) The use of impact factor as a measure of quality is widespread because it fits well with   the opinion we have in each field of the best journals in our speciality.”   (Hoeffel C. Journal Impact factors. Allergy. 1998;53;1225) Medical Library
  34. 34. JCR – Impact Factors (3)Some JIF-derivatives (relevant for determining publication strategy):• “Journal Ranking” and “Quartile in Category”• Aggregate Impact Factor• Median Impact Factor• Immediacy Index Medical Library
  35. 35. JCR – Impact Factors (5)Assignment 5.1. What is the 2011 impact factor of The Lancet?2. Let’s pretend you’re about to send your manuscript to one of the top- ranked IF journals in your discipline (≈ category). One of your colleagues  suggests the Journal of NeuroEngineering and Rehabilitationa. What is the 2011 impact factor of this journal?b. Describe in plain language what your answer under 2a expressesc. Explain why your decision to send your manuscript to this journal could  depend on whether you are a neuroscientist or a physiotherapist. Hint:  take into account the journal’s category score. 3. What is the 2009 impact factor of Aids Care?4.Does the official IF address self cites? Medical Library
  36. 36. JCR – Impact Factors: recapH – Index & JIF quizz: True or False? H-Index JIFDescribes journal impactDescribes author impactBased on fixed source dataIs adjusted for publication type(i.e. letter to the editor versus systematic review etc.)Is adjusted for self citation(resp. of own publications and own journal)Allows for interdisciplinairy benchmarking Medical Library
  37. 37. Do you have any questions?Medical Library