bibliometrics for beginners

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A bit on bibliometrics Science Librarian Rachel Henderson (CHE / PHA / CMP / MTH) [email protected] .uk Jane Helgesen Information Skills Librarian [email protected]

Author: rachel-henderson

Post on 10-May-2015




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Presentation covering introduction to bibliometrics. Suggested audience: PGRs, early career researchers, academic staff wanting refresher, research support staff


2. Session aimsWhy do you need to know this?Introduction to terminologyExploring the resources 3. Why do you need to know this?Scholarly communication: tracing the history andevolution of ideas from one scholar to anotherCan be seen to measure the scholarly influence ofarticles; journals; scholarsUsed with other factors in UK Research ExcellenceFramework (REF) to determine importance ofresearch and award money to the institution 4. Garfields metricsEugene Garfield: Father of citation analysisdeveloped the first bibliometric index toolsCitation countImpact factorImmediacy IndexCitation Half-life 5. Citation countNumber of times cited within a give time period Author JournalDoes not take into account materials outside ofcitation database so differs depending on source 6. Exercise Web of Science subject search sort by Timescited 7. Impact factorMeasures impact of a journal (not an article) within agiven subjectFormula is a ratio: Number of citations to a journal in a given year for articles occurring in previous 2 years. DIVIDED BY number of scholarly articles published in the journal during those 2 yearsSo 2011 JIF = Citations in 2011 to articles published2009-10 / articles published 2009-10 8. ExerciseLook at Journal Citation Reports for a journal thatyou useFind via Web of Science /Additional Resources 9. Concerns with impact factor Cant be used to compare cross disciplinary due todifferent rates of publication & citation 2 year time frame not adequate for non-scientificdisciplines (has been adjusted to 3-5 years) Coverage of some disciplines not sufficient in theISI databases Reviews will cite more journals may include moreto boost impact factor Doesnt measure individual researchers impact Is a measure of impact a measure of quality? 10. Immediacy index - definition What its supposed to measure: how quicklyarticles in a given journal have an impact on thediscipline Formula: the average number of times an article ina journal in a given year was cited in that same year 11. Citation half-life - definitionWhat its supposed to measure: Long-termrelevance of articles in a given journalFormula: median age of articles cited for aparticular journal in a given year 12. Hirsch (H) indexWhat its supposed to measure: Productivity of anindividual, group or institutionFormula: H value is equal to the number of papers(n) that have n or more citationsIt will vary depending on the index database journalcoverageBiased against early-career researchers as wonthave had time to be so productive but study byHirsch suggests its a predictor of future qualityoutput 13. H index - exerciseScopus Author IdentifierWoS author finder 14. AltmetricsUses web stats to provide more detailed assessmentof online activity beyond citations Use of open data Blog/twitter mentions 15. References & websitesEYSENBACH, G. 2011. Can Tweets Predict Citations? Metrics of Social Impact Based on Twitter and Correlation with Traditional Metrics of Scientific Impact. J Med Internet Res [Online]. Available: RAAN, A. F. J. 2006. Comparison of the Hirsch-index with standard bibliometric indicators and with peer judgment for 147 chemistry research groups. Scientometrics, 67, 491-502.WILLIAMS, G. 2007. Should we ditch impact factors? BMJ, 334, 568-568. 16. Thanks to Elaine Bergman who gave permissionfor content to be used from welcome feedback on this session - did you find out what you needed to know?