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www.le.ac.uk/library
Journal impact factors: use and misuse
Ian Rowlands
University Library
Research Festival 2014 Researc...
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
i...
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
Econo...
Don’t compare IFs across disciplines
1 2 3 4 5 6 7 8 9 10 11 12 13
Citationsrecieved
Years after publication
Genetics Math...
Don’t compare IFs across disciplines
1 2 3 4 5 6 7 8 9 10 11 12 13
Citationsrecieved
Years after publication
Genetics Math...
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...
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 avera...
Don’t judge an article by its cover
top 10% of articles generate
40% of all citations …
… 82% of articles are `below avera...
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 Sectio...
Summary
• DO use IFs to target influential journals for reading or
potential publication
• DON’T compare IFs across discip...
www.le.ac.uk/library
TOMORROW
Don’t lose credit for your research
Ian Rowlands
University Library
Research Festival 2014 R...
Journal impact factors: use and misuse
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Journal impact factors: use and misuse

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Transcript of "Journal impact factors: use and misuse"

  1. 1. www.le.ac.uk/library Journal impact factors: use and misuse Ian Rowlands University Library Research Festival 2014 Research Bytes 3
  2. 2. Journal impact factors What are journal impact factors? Where can I find them? Three common pitfalls
  3. 3. What are journal impact factors?
  4. 4. The journal impact factor 2012 example papers published in 2010 papers published in 2011 +
  5. 5. The journal impact factor 2012 example citations accrued during 2012 papers published in 2010 papers published in 2011 + ÷
  6. 6. 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
  7. 7. Where can I find them?
  8. 8. Where can I find them?
  9. 9. Journal Citation Reports Journal Citation Reports ® Thomson Reuters 2012 Immunology subject category
  10. 10. Three common pitfalls 1. Don’t compare IFs across disciplines
  11. 11. 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
  12. 12. 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
  13. 13. 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
  14. 14. Three common pitfalls 2. Take the rankings with a pinch of salt
  15. 15. 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)
  16. 16. Take the rankings with a pinch of salt
  17. 17. Three common pitfalls 3. Don’t judge an article by its cover
  18. 18. Don’t judge an article by its cover
  19. 19. Don’t judge an article by its cover top 10% of articles generate 40% of all citations …
  20. 20. Don’t judge an article by its cover top 10% of articles generate 40% of all citations … … 82% of articles are `below average’
  21. 21. 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 …
  22. 22. 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
  23. 23. 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
  24. 24. 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
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