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      Ten-Year Cross-Disciplinary Comparison of the Growth of Open Access and How it Increases Research Citation Impact


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          Lawrence (2001)found computer science articles that were openly accessible (OA) on the Web were cited more. We replicated this in physics. We tested 1,307,038 articles published across 12 years (1992-2003) in 10 disciplines (Biology, Psychology, Sociology, Health, Political Science, Economics, Education, Law, Business, Management). A robot trawls the Web for full-texts using reference metadata ISI citation data (signal detectability d'=2.45; bias = 0.52). Percentage OA (relative to total OA + NOA) articles varies from 5%-16% (depending on discipline, year and country) and is slowly climbing annually (correlation r=.76, sample size N=12, probability p < 0.005). Comparing OA and NOA articles in the same journal/year, OA articles have consistently more citations, the advantage varying from 36%-172% by discipline and year. Comparing articles within six citation ranges (0, 1, 2-3, 4-7, 8-15, 16+ citations), the annual percentage of OA articles is growing significantly faster than NOA within every citation range (r > .90, N=12, p < .0005) and the effect is greater with the more highly cited articles (r = .98, N=6, p < .005). Causality cannot be determined from these data, but our prior finding of a similar pattern in physics, where percent OA is much higher (and even approaches 100% in some subfields), makes it unlikely that the OA citation advantage is merely or mostly a self-selection bias (for making only one's better articles OA). Further research will analyze the effect's timing, causal components and relation to other variables.

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          Most cited references 6

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          An introduction to latent semantic analysis

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            What is a Citation Worth?

             Arthur Jr. (1987)
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              The Access/Impact Problem and the Green and Gold Roads to Open Access


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                IEEE Data Engineering Bulletin 28(4): 39-47; 2005
                10 pages, 5 figures, 3 tables

                Information & Library science


                - Method: Assessed prevalence and characteristics of OA using the reference metadata for 1,307,038 articles published in peer-reviewed journals covered by the CDROM version of ISI’s Science and Social Science Citation Indices (SCI and SSCI). The 10 disciplines covered were: administration, economics, education, business, psychology, health, political science, sociology, biology, and law, for 12 years: 1992-2003.

                - Findings: The percentage of overall OA levels varied from 5%-16% between the disciplines; with biology (15.0%) and economics (13.5%) being at the high end, followed by business (9.0%), management and psychology (both 7%), health (6.2%), education (5.3%) and law (5.1%).

                2018-04-17 09:37 UTC

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