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The number of scholarly documents on the public web
Khabsa, Madian ; Giles, C Lee Zhang, Ren
PloS one, 2014-05, Vol.9 (5), p.e93949-e93949
[Periódico revisado por pares]
United States: Public Library of Science
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Título:
The number of scholarly documents on the public web
Autor:
Khabsa, Madian
;
Giles, C Lee
Zhang, Ren
Assuntos:
Agricultural economics
;
Agricultural sciences
;
Agrochemicals
;
Agronomy
;
Automation
;
Capture-recapture studies
;
Citations
;
Computer and Information Sciences
;
Computer networks
;
Computer science
;
Economics - statistics & numerical data
;
Engineering
;
Environmental engineering
;
Environmental science
;
Environmental sciences
;
Estimates
;
Humanities - statistics & numerical data
;
Humans
;
Information Dissemination
;
Internet - statistics & numerical data
;
Internet/Web search services
;
Medicine - statistics & numerical data
;
Open access
;
Physical Sciences
;
Physics
;
Physics - statistics & numerical data
;
Publications - statistics & numerical data
;
Research and Analysis Methods
;
Researchers
;
Scholars
;
Science - statistics & numerical data
;
Science Policy
;
Scientific papers
;
Scientometrics
;
Search Engine - statistics & numerical data
;
Search engines
;
Social Sciences
;
Studies
;
World Wide Web
É parte de:
PloS one, 2014-05, Vol.9 (5), p.e93949-e93949
Notas:
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Conceived and designed the experiments: CLG MK. Performed the experiments: CLG MK. Analyzed the data: CLG MK. Contributed reagents/materials/analysis tools: CLG MK. Wrote the paper: CLG MK.
Competing Interests: The authors have declared that no competing interests exist.
Descrição:
The number of scholarly documents available on the web is estimated using capture/recapture methods by studying the coverage of two major academic search engines: Google Scholar and Microsoft Academic Search. Our estimates show that at least 114 million English-language scholarly documents are accessible on the web, of which Google Scholar has nearly 100 million. Of these, we estimate that at least 27 million (24%) are freely available since they do not require a subscription or payment of any kind. In addition, at a finer scale, we also estimate the number of scholarly documents on the web for fifteen fields: Agricultural Science, Arts and Humanities, Biology, Chemistry, Computer Science, Economics and Business, Engineering, Environmental Sciences, Geosciences, Material Science, Mathematics, Medicine, Physics, Social Sciences, and Multidisciplinary, as defined by Microsoft Academic Search. In addition, we show that among these fields the percentage of documents defined as freely available varies significantly, i.e., from 12 to 50%.
Editor:
United States: Public Library of Science
Idioma:
Inglês
Links
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