Ten-Year Cross-Disciplinary Comparison of the Growth of Open Access and How it Increases Research Citation Impact
<|reference_start|>Ten-Year Cross-Disciplinary Comparison of the Growth of Open Access and How it Increases Research Citation Impact: 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.<|reference_end|>
@article{hajjem2006ten-year,
    title={Ten-Year Cross-Disciplinary Comparison of the Growth of Open Access and
  How it Increases Research Citation Impact},
    author={C. Hajjem, S. Harnad, Y. Gingras},
    journal={IEEE Data Engineering Bulletin 28(4): 39-47; 2005},
    year={2006},
    archivePrefix={arXiv},
    eprint={cs/0606079},
    primaryClass={cs.DL}
}