Citation Analysis of Open Access Journals

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Citation Analysis of Open Access Journals

• Marie E. McVeigh

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Overview

• What is Open Access
• In principle
• In practice
• Thomson coverage of OA journals
• Measuring the effect of OA
• on a journal
• on an article

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What is Open Access In principle
OA Budapest Principles Free availability on
the public Internet, permitting end users to
read, download, copy, distribute, print, search,
or link to the full texts of these articles,
crawl them for indexing, pass them as data to
software, or use them for any other lawful
purpose, without financial, legal, or technical
barriers other than those inseparable from
gaining access to the Internet itself.
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What is OA in practice

• Nine flavors of Open Access
• Unqualified OA PLoS Biology
• Partial OA Mayo Clinic Proceedings
• Delayed OA Molecular Biology of the Cell
• Author-fee OA BMC Bioinformatics PLoS Biology
• Dual Mode Journal of Post Graduate Medicine
• Co-op OA SPARC
• OA Abstracts Springer Link Science Direct
• Per-capita OA HINARI (WHO), INASP
• Article-level archiving topical (arXiv)
  institutional (NIH-PubMed Central), individual
  (author website)

J. Wilinsky (2003). Journal of Post Graduate
Medicine 49(3) 263-267
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Data from Directory of Open Access Journals
(www.doaj.org) courtesy of Lund University
Libraries, Head Office
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Thomson ISI Coverage of Open Access Journals

• Peer-reviewed, scholarly journals no charge to
  readers or their institutions to access or
  download the most recently published content.
• Three resources consulted
• Directory of Open Access Journals www.doaj.org
• SciELO www.scielo.br
• J-STAGE - http//www.jstage.jst.go.jp/
• Total of 1638 journals (as of May 2005)
• 270 journals covered in Web of Science.

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• Effect of Open Access
• at the journal level

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T H O M S O N S C I E N T I F I C
Immediacy Index
2003
2002
2001
All Previous Years
Impact Factor
Cited ½ LIfe
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Citation Performance of OA journals
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Average age of OA journal37.0 yrs Average
number of years OA 7.4 Cited ½ life for all
journals (OATraditional Access) 6.5 years (in
red)
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Summary

• Although the access status of any given journal
  may change with time, there is a net increase in
  the number of journals using OA distribution.
• OA journals occur at all IF levels while their
  distribution varies by field, most subjects have
  at least one OA journal among their top-ranked
  publications.
• OA journals, overall, show a higher rank by
  Immediacy Index than by Impact Factor, suggesting
  more rapid uptake into the literature.

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Other OA journals

• Unqualified OA PLoS Biology
• Partial OA Mayo Clinic Proceedings
• Delayed OA Molecular Biology of the Cell

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Jun-1992
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How much material is Open Access

• Recent study of 174 journals in clinical and
  research medicine (defined by the JCR categories
  Medicine, General Internal, and Medicine,
  Research Experimental).
• 93 have materials available electronically.
• 43 have at least some Open Access article
  content, whether current (UOA, POA) or archival
  (DOA).
• Approximately 60 of article content from
  1992-2004 is available electronically
  approximately 20 is Open Access.

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OA and Impact Medicine, General Internal
Source Data 2003 Journal Citation Reports
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OA and Impact Medicine, Research Experimental
Source Data 2003 Journal Citation Reports
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Effect of Open Access at the article level
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Measuring the effect of OA article level
Steve Lawrence (2001). Online or Invisible.
http//citeseer.ist.psu.edu/
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Measuring the effect of OA article level
Kristin Antelman (2004). Do Open-Access
articles have a greater research impact?
College Research Libraries.
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Which articles are OA?

• 48,000 Medline articles queried on Google to
  locate free copy (pdf) of the article on a site
  other than the journal/publisher site.
• Considered both OA and non-OA journals
• Probability of finding an article freely
  available correlated with how recently the
  article was published, and with the IF of the
  original source journal

Jonathan D. Wren (2005). Open Access and Openly
Accessible A study of scientific publications
shared via the internet. British Medical
Journal.
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Thank you
marie.mcveigh_at_thomson.com