1.
Simple Yet Effective Methods for Large-Scale
Scholarly Publication Ranking
KMi and Mendeley (team BletchleyPark) at WSDM Cup 2016
Drahomira Herrmannova & Petr Knoth
The Open University & Mendeley
WSDM Cup 2016, February 2016
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2.
Our approach
• Hypothesis
• the importance of a publication can be determined by a
mixture of factors evidencing its impact and the importance of
entities which participated in the publication’s creation
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3.
Our approach
• Method
1 separately score each of the types of entities in the graph
2 use the separate scores to provide a publication score
3 we obtain several different scores for the publication entities
4 final score, which defines publication’s rank, is calculated using
linear combination of the scores
• Weights obtained experimentally
• The final equation
score(p) =2.5 · spub + 0.1 · sage + 1.0 · spr+
1.0 · sauth + 0.1 · svenue + 0.01 · sinst
(1)
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4.
Publication-based scoring functions
score(p) = 2.5 · spub + 0.1 · sage + 1.0 · spr +
1.0 · sauth + 0.1 · svenue + 0.01 · sinst
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5.
Publication-based scoring functions
• Scoring publication entities directly (without considering the
importance of authors or venues)
• We have experimented with several options of normalising and
weighting publication citations
• Applying a time decay to citations
• Applying a decay function to total citation counts
• Using mean citation counts
• Final scoring function:
spub(p) =
c(p)/|Ap|, for c(p) ≤ t
t/|Ap|, for c(p) > t
(2)
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6.
Publication-based scoring functions
• To account for publication age we added a score based on age:
sage(p) = yp (3)
• In the second phase of the challenge we have included
PageRank as an additional feature:
spr(p) = PR(p) (4)
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7.
Author-based score
score(p) =2.5 · spub + 0.1 · sage + 1.0 · spr+
1.0 · sauth +0.1 · svenue + 0.01 · sinst
(5)
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8.
Author-based score
• We’ve experimented with some commonly used methods for
evaluating author performance (number of citations, h-index)
• We calculated the given value and each of the authors of a
publication and tested scoring publications using maximum,
total and mean of these values
• Final scoring function uses mean citation score per publication
and author:
sauth(p) =
a∈Ap
x∈Pa
c(x)
|Pa|
|Ap|
(6)
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9.
Venue-based score
score(p) =2.5 · spub + 0.1 · sage + 1.0 · spr+
1.0 · sauth + 0.1 · svenue + 0.01 · sinst
(7)
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10.
Venue-based score
• Standard metric in this area is the JIF, alternatives – Scimago
Journal Rank, Eigenfactor
• We have experimented with few simple scoring functions (JIF,
total citation counts, ...)
• Final venue-based score:
svenue(p) =
x∈Pv,x=p
c(x) (8)
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11.
Institution-based score
score(p) =2.5 · spub + 0.1 · sage + 1.0 · spr+
1.0 · sauth + 0.1 · svenue + 0.01 · sinst
(9)
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12.
Institution-based score
• Simple approach similar to author- and venue-based scores:
sinst(p) =
i∈Ip x∈Pi,x=p c(x)
|Ip|
(10)
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13.
Potential improvements
• Better utilisation of the citation network
• Inclusion of additional data sources
• Possibility to analyse the evaluation data and metric
• Revise the maximum citation threshold used in the spub score
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14.
What have we learned?
• We found simple citation counts to perform best, but (!):
• In order to develop more optimal ranking method, it is crucial
to better understand the evaluation data and method
• Citation counting does not account for many characteristics of
citations (differences in their meaning, popularity of certain
topics and types of research papers, ...)
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15.
Alternative ranking methods
• We’ve explored several external datasources
• Motivation – utilising new altmetric and webometric
datasources
• Early availability of the data compared compared to citations
• Broader view of publication’s impact
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16.
Alternative ranking methods
• Our main interest is in full-text and the set of metrics referred
to as Semantometrics
• Semantometrics build on the premise the manuscript of the
publication is needed to assess its value (in contrast to utilising
external data)
• Biggest problem – obtaining the full-texts due to copyright
restrictions and paywalls
• We’re experimenting with enriching the MAG with the
publication full-texts
• Enriching MAG with altmetric, webometric and
semantometric data would enable developing and testing
fundamentally new metrics
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17.
Thank you for listening!
• Sources
• https://github.com/damirah/wsdm_cup
• Workshop on Mining Scientific Publications
• http://wosp.core.ac.uk/jcdl2016/
• Submission deadline – 17th April
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