Journal impact factors: use and misuse
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Journal impact factors: use and misuse

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Journal impact factors: use and misuse Journal impact factors: use and misuse Presentation Transcript

  • www.le.ac.uk/library Journal impact factors: use and misuse Ian Rowlands University Library Research Festival 2014 Research Bytes 3
  • Journal impact factors What are journal impact factors? Where can I find them? Three common pitfalls
  • What are journal impact factors?
  • The journal impact factor 2012 example papers published in 2010 papers published in 2011 +
  • The journal impact factor 2012 example citations accrued during 2012 papers published in 2010 papers published in 2011 + ÷
  • The journal impact factor 2012 example 100 citations accrued during 2012 30 papers published in 2010 20 papers published in 2011 + ÷ JIF = 100 citations / 50 papers = 2.0
  • Where can I find them?
  • Where can I find them?
  • Journal Citation Reports Journal Citation Reports ® Thomson Reuters 2012 Immunology subject category
  • Three common pitfalls 1. Don’t compare IFs across disciplines
  • Don’t compare IFs across disciplines 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 History Mathematics Economics Business Polymer science Materials science Genetics and heredity Multidisciplinary sciences Mean journal impact factor (2012) Source: Thomson Reuters Journal Citation Reports
  • Don’t compare IFs across disciplines 1 2 3 4 5 6 7 8 9 10 11 12 13 Citationsrecieved Years after publication Genetics Mathematics
  • Don’t compare IFs across disciplines 1 2 3 4 5 6 7 8 9 10 11 12 13 Citationsrecieved Years after publication Genetics Mathematics
  • Three common pitfalls 2. Take the rankings with a pinch of salt
  • Take the rankings with a pinch of salt -125% -100% -75% -50% -25% 0% 25% 50% 75% 100% 125% 150% 175% 0 100 200 300 400 500 600 700 800 900 1000 Mean%changeinIF(2011on2010) Journal size (2011 articles)
  • Take the rankings with a pinch of salt
  • Three common pitfalls 3. Don’t judge an article by its cover
  • Don’t judge an article by its cover
  • Don’t judge an article by its cover top 10% of articles generate 40% of all citations …
  • Don’t judge an article by its cover top 10% of articles generate 40% of all citations … … 82% of articles are `below average’
  • Don’t judge an article by its cover top 10% of articles generate 40% of all citations … … 82% of articles are `below average’ Bill Gates gets on the train …
  • Don’t judge an article by its cover 2.051 49.926 54.333 2.076 2.244 2008 2009 2010 2011 2012 Acta Crystallographica Section A Journal impact factor
  • Summary • DO use IFs to target influential journals for reading or potential publication • DON’T compare IFs across disciplines • DON’T take the rankings too literally • DON’T confuse journal and article level metrics • DO apply common sense
  • www.le.ac.uk/library TOMORROW Don’t lose credit for your research Ian Rowlands University Library Research Festival 2014 Research Bytes 4 Attenborough ATT212, 13:00-13:30