bibliometrics for beginners
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Transcript of bibliometrics for beginners
A bit on bibliometrics
Science Librarian
Rachel Henderson(CHE / PHA / CMP / MTH)
Jane HelgesenInformation Skills Librarian
Session aims
Why do you need to know this?
Introduction to terminology
Exploring the resources
Why do you need to know this?
Scholarly communication: tracing the history and evolution of ideas from one scholar to another
Can be seen to measure the scholarly influence of articles; journals; scholars
Used with other factors in UK Research Excellence Framework (REF) to determine importance of research and award money to the institution
Garfield’s metrics
Eugene Garfield: ‘Father of citation analysis’ developed the first bibliometric index tools
Citation count
Impact factor
Immediacy Index
Citation Half-life
Citation count
Number of times cited within a give time period
Author
Journal
Does not take into account materials outside of citation database so differs depending on source
Exercise
Web of Science subject search – sort by ‘Times cited’
Impact factor
Measures ‘impact’ of a journal (not an article) within a given subject
Formula 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 years
So 2011 JIF = Citations in 2011 to articles published 2009-10 / articles published 2009-10
Exercise
Look at Journal Citation Reports for a journal that you use
Find via Web of Science /Additional Resources
Concerns with impact factor
Can’t be used to compare cross disciplinary due to different rates of publication & citation
2 year time frame not adequate for non-scientific disciplines (has been adjusted to 3-5 years)
Coverage of some disciplines not sufficient in the ISI databases
Reviews will cite more – journals may include more to boost impact factor
Doesn’t measure individual researcher’s impact
Is a measure of ‘impact’ a measure of quality?
Immediacy index - definition
What it’s supposed to measure: how quickly articles in a given journal have an impact on the discipline
Formula: the average number of times an article in a journal in a given year was cited in that same year
Citation half-life - definition
What it’s supposed to measure: Long-term relevance of articles in a given journal
Formula: median age of articles cited for a particular journal in a given year
Hirsch (H) index
What it’s supposed to measure: Productivity of an individual, group or institution
Formula: H value is equal to the number of papers (n) that have n or more citations
It will vary depending on the index database journal coverage
Biased against early-career researchers as won’t have had time to be so productive – but study by Hirsch suggests it’s a predictor of future quality output
H index - exercise
Scopus Author Identifier
WoS author finder
Altmetrics
Uses web stats to provide more detailed assessment of online activity – beyond citations
Use of open dataBlog/twitter mentions
http://altmetrics.org/manifesto/
References & websites
EYSENBACH, 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: http://www.jmir.org/2011/4/e123/.
VAN 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.
http://www.cwts.nl/ranking/LeidenRankingWebSite.htmlhttp://www.uea.ac.uk/is/collections/researchsupport/Bibliohttp://www.ndlr.ie/myri/index.html
Thanks to Elaine Bergman who gave permission for content to be used from http://www.slideshare.net/librarian68/bibliometrics-primer
We welcome feedback on this session - did you find out what you needed to know?