Jevin D. West
University of Washington
The Eigenfactor Metrics: a network
approach to assessing scholarly journals
jevinw@...
The Eigenfactor Project
Q: How does network structure affect function?
The Eigenfactor Algorithm
Q: How can we better eval...
Citation Networks, Scaling Up
Network Effects, Centrality 
Eigenfactor,Article Influence
Mapping, Future Directions
Citation Networks
Citation Networks, Scaling Up
Citations
Citations
Scholarship is all about
the flow of ideas
Networks are all about
the flow of information
Citations form a vast network
de Solla Price, Science (1965)
Citations among Authors
Eugene Garfield
Derek de Solla Price
Citations among Journals
Physical Review Letters
Ecology Letters
What happens when you scale up?
12,000 Journals
150,000,000 Citations
How do we identify the important journals? 
…using only the citation network

…but all of the citation network

Network Effects
Network Effects, Centrality
High School Dating Network
Image Courtesy of Mark Newman
System Scale: NetworkTopology Matters
High School Dating Network
Q: Which network would MONO prefer?

Individual Scale: Co...
Image Courtesy of Mark Newman
Who is the most ‘influential’ high school student?
Degree Centrality
Eigenvector Centrality
Links
9

5

4

3

2

1

Degree Centrality
Number of students
1







2







3








4








5









6







7

...
Accounting for the Network
The Network Matters
This network property of the scholarly literature
was largely ignored over the first century of
scholarly evaluation.
How c...
Impact factor
Cites in 2010 to articles in 2009 or 2008 
Number of articles in 2009 and 2008
Garfield, Science (1955)
Impact Factor
2010
2008 - 2009
2 articles
IF2010 =
3
2
3 citations
Impact Factor
Eigenfactor
Citation Networks, Scaling Up
Network Effects, Centrality 
Eigenfactor,Article Influence
Mapping, Future Directions
Eigenfactor algorithm
Eigenfactor – taking into account the network
25 nodes and 42 unweighted, undirected links
25 nodes and 42 weighted, undirected links
25 nodes and 42 weighted, directed links
Which node is the most central? 
4

2

6

5

3

1

11

9

7

10

8

21

20
18

19...
Applet: Daniel Edler
Deterministic: iterative voting
Stochastic: random walker
Eigenfactor –TopTen Journals in Science (2008)
Rank
 Journal
 Eigenfactor
1
 Nature
 1.76
2
 PNAS
 1.70
3
 Science
 1.58
4...
Eigenfactor –TopTen Journals in Science (2008)
Rank
 Journal
 Eigenfactor
1
 Nature
 1.76 %
2
 PNAS
 1.70 %
3
 Science
 1....
Article Influence =
Eigenfactor 
# articles 
Eigenfactor, Ranking  Mapping
Article Influence –TopTen Journals in Science (2008)
Rank
 Journal
 Article Influence
1
 Review of Modern Physics
 24.9
2
 A...
Article Influence vs. Impact Factor
Impact Factor, Eigenfactor
Ecology and Evolution (2007)
0.1

0.1

0.1

0.1

0.1
0.5

Impact
Factor

Eigenfactor

0.342
 0.316

0.147

0.103

0.056

0.036

Mapping
Mapping, Future Directions
good maps simplify 

 
and highlight

 
 
 relevant structures
The map equation tells us the description
length for a particular modular structure
The Map Equation
Hierarchical Maps
1995
 2004
Alluvial diagrams
Image:
NASA

Rosvall

Bergstrom
(2010)

Mapping, Future Directions
Future Directions
How can we better
evaluate the scholarly literature?
How can we better
navigate the scholarly literature?
Ranking
1.  …..

2.  …

3.  …

4.  …

5.  …..

6.  …

7.  ..

8.  …..

9.  ..



Mapping
Scholarly Feedback
Document
Delivery
vs
Document
Discovery

1.

Convenient
access
to
lots
of
data

2.

ConnecKvity
of
the
data

The
Impact
of...
Acknowledgements
Carl Bergstrom 
Daril Vilhena
 Martin Rosvall

Ben Althouse 
 
Ted Bergstrom 
 
Johan Bollen 
Ralph Dandr...
Jevin west eigen factor
Jevin west eigen factor
Jevin west eigen factor
Jevin west eigen factor
Jevin west eigen factor
Jevin west eigen factor
Jevin west eigen factor
Upcoming SlideShare
Loading in …5
×

Jevin west eigen factor

1,009 views
819 views

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
1,009
On SlideShare
0
From Embeds
0
Number of Embeds
4
Actions
Shares
0
Downloads
9
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Jevin west eigen factor

  1. 1. Jevin D. West University of Washington The Eigenfactor Metrics: a network approach to assessing scholarly journals jevinw@u.washington.edu
  2. 2. The Eigenfactor Project Q: How does network structure affect function? The Eigenfactor Algorithm Q: How can we better evaluate the scholarly literature?
  3. 3. Citation Networks, Scaling Up Network Effects, Centrality Eigenfactor,Article Influence Mapping, Future Directions
  4. 4. Citation Networks Citation Networks, Scaling Up
  5. 5. Citations
  6. 6. Citations
  7. 7. Scholarship is all about the flow of ideas
  8. 8. Networks are all about the flow of information
  9. 9. Citations form a vast network de Solla Price, Science (1965)
  10. 10. Citations among Authors Eugene Garfield Derek de Solla Price
  11. 11. Citations among Journals Physical Review Letters Ecology Letters
  12. 12. What happens when you scale up? 12,000 Journals 150,000,000 Citations
  13. 13. How do we identify the important journals? …using only the citation network
 …but all of the citation network

  14. 14. Network Effects Network Effects, Centrality
  15. 15. High School Dating Network Image Courtesy of Mark Newman
  16. 16. System Scale: NetworkTopology Matters High School Dating Network Q: Which network would MONO prefer?
 Individual Scale: Connection Source Matters Q: Which girl/boy should I date if I don’t want MONO?
  17. 17. Image Courtesy of Mark Newman Who is the most ‘influential’ high school student?
  18. 18. Degree Centrality Eigenvector Centrality
  19. 19. Links 9
 5
 4
 3
 2
 1
 Degree Centrality Number of students 1







2







3








4








5









6







7









8







9




10




11





12




13





14






  20. 20. Accounting for the Network
  21. 21. The Network Matters
  22. 22. This network property of the scholarly literature was largely ignored over the first century of scholarly evaluation. How can we extract this information in order to better measure information flow?
  23. 23. Impact factor Cites in 2010 to articles in 2009 or 2008 Number of articles in 2009 and 2008 Garfield, Science (1955)
  24. 24. Impact Factor 2010 2008 - 2009 2 articles IF2010 = 3 2 3 citations
  25. 25. Impact Factor Eigenfactor
  26. 26. Citation Networks, Scaling Up Network Effects, Centrality Eigenfactor,Article Influence Mapping, Future Directions
  27. 27. Eigenfactor algorithm Eigenfactor – taking into account the network
  28. 28. 25 nodes and 42 unweighted, undirected links
  29. 29. 25 nodes and 42 weighted, undirected links
  30. 30. 25 nodes and 42 weighted, directed links Which node is the most central? 4
 2
 6
 5
 3
 1
 11
 9
 7
 10
 8
 21
 20
18
 19
 17
 16
 15
 14
 13
 12
 25
 23
 22
 24

  31. 31. Applet: Daniel Edler Deterministic: iterative voting Stochastic: random walker
  32. 32. Eigenfactor –TopTen Journals in Science (2008) Rank Journal Eigenfactor 1 Nature 1.76 2 PNAS 1.70 3 Science 1.58 4 Journal of Biological Chemistry 1.33 5 Physical Review Letters 1.28 6 Journal of the American Chemical Society 0.95 7 Physical Review B 0.77 8 Applied Physics Letters 0.72 9 New England Journal of Medicine 0.68 10 Cell 0.67 Total number of journals ranked = 8,232
  33. 33. Eigenfactor –TopTen Journals in Science (2008) Rank Journal Eigenfactor 1 Nature 1.76 % 2 PNAS 1.70 % 3 Science 1.58 % 4 Journal of Biological Chemistry 1.33 % 5 Physical Review Letters 1.28 % 6 Journal of the American Chemical Society 0.95 % 7 Physical Review B 0.77 % 8 Applied Physics Letters 0.72 % 9 New England Journal of Medicine 0.68 % 10 Cell 0.67 % Total number of journals ranked = 8,232
  34. 34. Article Influence = Eigenfactor # articles Eigenfactor, Ranking Mapping
  35. 35. Article Influence –TopTen Journals in Science (2008) Rank Journal Article Influence 1 Review of Modern Physics 24.9 2 Annual Review of Immunology 24.7 3 Annual Review of Biochemistry 20.9 4 Nature Reviews Molecular Cell Biology 20.0 5 Annual Review of Neuroscience 18.9 6 Cell 18.9 7 New England Journal of Medicine 18.8 8 CA – A Cancer Journal for Clinicians 17.5 9 Nature 17.3 10 Science 16.3 Total number of journals ranked = 8,232
  36. 36. Article Influence vs. Impact Factor Impact Factor, Eigenfactor
  37. 37. Ecology and Evolution (2007)
  38. 38. 0.1
 0.1
 0.1
 0.1
 0.1
0.5
 Impact
Factor

  39. 39. Eigenfactor
 0.342
 0.316
 0.147
 0.103
 0.056
 0.036

  40. 40. Mapping Mapping, Future Directions
  41. 41. good maps simplify and highlight relevant structures
  42. 42. The map equation tells us the description length for a particular modular structure The Map Equation
  43. 43. Hierarchical Maps
  44. 44. 1995 2004
  45. 45. Alluvial diagrams Image:
NASA

  46. 46. Rosvall

Bergstrom
(2010)

  47. 47. Mapping, Future Directions Future Directions
  48. 48. How can we better evaluate the scholarly literature?
  49. 49. How can we better navigate the scholarly literature?
  50. 50. Ranking 1.  …..
 2.  …
 3.  …
 4.  …
 5.  …..
 6.  …
 7.  ..
 8.  …..
 9.  ..
 
 Mapping
  51. 51. Scholarly Feedback
  52. 52. Document
Delivery
vs
Document
Discovery
 1.

Convenient
access
to
lots
of
data
 2.

ConnecKvity
of
the
data
 The
Impact
of
the
Internet
 The
Impact
of
the
Scholar‐net
 1.

Convenient
access
to
lots
of
data
 2.

ConnecKvity
of
the
data

  53. 53. Acknowledgements Carl Bergstrom Daril Vilhena Martin Rosvall Ben Althouse Ted Bergstrom Johan Bollen Ralph Dandrea Gail Dykstra Daniel Edler Alan Yen Gregg Gordon Michael Jensen Michael Kurtz Moritz Stefaner Theresa Portzer NaKonal
Science
FoundaKons
 NaKonal
InsKtutes
of
Health


×