Open access and global participation in science

Science

Volumn 323, Issue 5917, 2009, Pages 1025-

  Evans, James A ^a   Reimer, Jacob ^a  

^a UNIVERSITY OF CHICAGO   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ACCESSIBILITY; INCOME DISTRIBUTION; INTERNET; LOCAL PARTICIPATION; NATIONAL ECONOMY; POLICY MAKING; RESEARCH WORK; SCIENCE AND TECHNOLOGY;

HEALTH ECONOMICS; INFORMATION SERVICE; INTERNET; MANAGEMENT; ONLINE SYSTEM; PRIORITY JOURNAL; PUBLICATION; RUSSIAN FEDERATION; SCIENCE; SCIENTIST; SHORT SURVEY; UNITED NATIONS;

ACCESS TO INFORMATION; BIBLIOMETRICS; DEVELOPING COUNTRIES; INFORMATION DISSEMINATION; INTERNATIONALITY; INTERNET; PERIODICALS AS TOPIC;

EID: 60749085078     PISSN: 00368075     EISSN: 10959203     Source Type: Journal    
DOI: 10.1126/science.1154562     Document Type: Short Survey

References (12)

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8. GNI is used instead of gross domestic product (GDP) because it more precisely captures average, realized income. We first used fixed effects Poisson regression models with robust standard errors to compare citations to journal volumes in periods when their articles were not available electronically to periods in which they were, commercially and for free. To control for the number of citations that would have been received without a change in online access, we used a log-normal curve fit to the empirical distribution of citations (10). All models control for the online commercial availability of research and are estimated for those articles published in years 1998-2005, after published research began to become available online and the influence of online access on subsequent citations became consistently positive (9, 11). Exponentiated Poisson coefficients represent incidence ratios: the ratio of citations in years with OA to those in years without. Reduced by one and multiplied by 100, these become percentage shifts in citation after free availability.
9. Materials and methods are available as supporting material on Science Online.
10. M. J. Stringer, M. Sales-Pardo, L. A. N. Amaral, PLoS One 3, e1683 (2008).
11. J. A. Evans, Science 321, 395 (2008).
12. Supported by NSF grant 0242971. We thank Thomson Reuters, Incorporated, for use of its SCI data.