This document describes a methodology to aggregate and link the scientific publications of Dutch professors between 2000-2010 using data from two sources: the NARCIS database containing bibliographic and affiliation information for Dutch scholars, and the CWTS bibliometric database containing over 23 million publications. Five "seed" approaches are used to initially link professor profiles between the two sources, which are then expanded using publication classification methods and Scopus author identifiers. Evaluation against a "gold standard" of 1,400 manually verified professor profiles found the micro-discipline and Scopus-based approaches identified 80% of Dutch professors with precision of 88.5% and recall of 95.9%. The methodology demonstrates the ability to connect different bibliographic databases and identify full publication profiles

1. Seed+Expand
aggregating the scientific output of the
Netherlands, 2000-2010
Linda Reijnhoudt, Rodrigo Costas, Ed Noyons,
Katy Börner, Andrea Scharnhorst
1
linda.reijnhoudt@dans.knaw.nl, andrea.scharnhorst@dans.knaw.nl
DANS, Royal Netherlands Academy of Arts and Sciences (KNAW), the Hague, the Netherlands
2
rcostas@cwts.leidenuniv.nl, noyons@cwts.leidenuniv.nl
Center for Science and Technology Studies (CWTS)-Leiden University, Leiden, the Netherlands
3
katy@indiana.edu
Cyberinfrastructure for Network Science Center, School of Library and Information Science, Indiana
University, Bloomington, Indiana, United States of America

2. to study the dynamics on the output of
Dutch professors (2001-2011)
but, lack of data on
the output of full professors!
goal

3. the problem
given a Dutch professor in the NARCIS system
find all his/her publications
how to connect bibliographic data from CWTS
with the NARCIS system?

4. CWTS
Bibliometric
publications database:
● author
● author-order
● email (sometimes)
● affiliation
(sometimes)
● journal
context
DANS
NARCIS
dutch scholars:
● name, initials
● DAI
● affiliations
● organisation
● email
=
?

5. non trivial I
● misspelled names
○ Van Knienberg instead Van Knippenberg
● different initials / first name
○ Johannes and Hans
● different formats in the data across sources
○ Prefixes separated in the NARCIS system
■ P.M.P. | van | Bergen en Henegouwen
○ Made initials or concatenated in WoS
■ Henegouwen, PMPVE (Henegouwen, Paul M. P. van Bergen En)

6. non trivial II
● multiple scholars have the same author
name (homonymy)
● the same scholar with multiple author
names (synonymy)
○ changes over time, e.g., due to marriage

7. the raw data
NARCIS database (DANS)
○ 8378 Dutch full professors
■ affiliation to dutch organizations
■ name, initials
■ email
■ DAI
CWTS bibiometric data system
○ close to 23 million publications in more than 12,000
journals
○ no unique author identifier for all authors

8. the Gold Standard
we already know the complete oeuvre of
1400 Dutch full professors, due to manually
verified publication lists by CWTS (2001-
2010)
USEFUL TO VALIDATE OUR METHODOLOGY
the 1400 of the 8376 (17%) full professors
who already appear in this list:
the Gold Standard

9. the sources & main overview

10. Seed+Expand main concept
● seed creation, precision
○ given a full professor, {initials, name, email, affiliations}
○ find one or more publications that are most likely
authored by this professor
● seed expansion, recall
○ given these 'seed' publications,
○ find publications by the same author
1. publication-based classifications
2. Scopus Author Identifier

11. seed creation
1. Email seed (EM)
2. Author Address approaches (*)
a. Reprint Author (RP)
b. Direct linkage author-addresses (DL)
c. Approximate linkage author addresses (AL)
3. Digital Author Identifier seed (DAI)
(*) For these seeds, very common
names have been excluded

12. seed expansion
1. CWTS Paper-Based Classification
(2001-2011)
○ based on citation relationships of publications
○ 672 meso, over 20K micro disciplines
○ micro: +23% unique papers over seed
○ meso: +34% unique papers over seed
2. Scopus Author Identifier (1996-2011)
○ +69% unique papers over seed

13. evaluation
Gold standard:2001-2010

14. results
● 80% of Dutch professors detected
● Micro-disciplines: highest precision (88.5)
● Scopus Author id & micro disciplines:
same recall (95.9)
● This methodology can be applied to other
sets and author identity schemes (ORCID,
VIVO, etc.)
● Further research on disciplinary
differences and improvements

15. general discussion
● increasing bibliographic data sources but
still lacking author disambiguated data!!
● lack of research on how to connect
databases
○ repositories
○ bibliographic databases (WoS, Scopus, etc.)
○ altmetrics
● e-mail data and DAI/ORCID-like
identifiers are powerful linking elements
across systems

16. the end ...
thank you very much for your attention!
questions?
comments?

17. five seeds
combined: 6753 of 8376 full professors found