We introduce an indicator to measure the diffusion of scientific research. Consistent with Stirling's 3-factor diversity model, the diffusion score captures not only variety and balance, but also disparity among citing article cohorts. We apply it to benchmark article samples from six 1995 Web of Science subject categories (SCs) to trace trends in knowledge diffusion over time since publication. Findings indicate that, for most SCs, diffusion scores steadily increase with time. Mathematics is an outlier. We employ a typology of citation trends among benchmark SCs and correlate this with diffusion scores. We also find that self-cites do not, in most cases, significantly influence diffusion scores.
Autant-Bernard, C, Mairesse, J, Massard, N 2007 Spatial knowledge diffusion through collaborative networks. Papers in Regional Science 86:341–350 .
Bacchiocchi, E, Montobbio, F 2009 Knowledge diffusion from university and public research. A comparison between US, Japan and Europe using patent citations. Journal of Technology Transfer 34 2 169–181 .
PH Birnbaum-More FA Rossini DR Baldwin eds. 1990 International research management Oxford University Press New York.
Chen, C, Chen, Y, Horowitz, M, Hou, H, Liu, Z, Pellegrino, D 2009 Towards an explanatory and computational theory of scientific discovery. Journal of Informetrics 3 3 191–209 .
Chen, C, Hicks, D 2004 Tracing knowledge diffusion. Scientometrics 59 2 199–211 .
Chubin, DE, Connolly, T 1982 Research trails and science policies: Local and extra-local negotiations of scientific work N Elias H Martins R Whitley eds. Scientific establishments and hierarchies. Sociology of the sciences, yearbook 6 D. Reidel Dordrecht 293–311 .
DE Chubin FA Rossini AL Porter T Connolly eds. 1986 Interdisciplinary analysis and research Lomond Mt. Airy, MD.
N De Bellis 2009 Bibliometrics and citation analysis: From the science citation index to cybermetrics Scarecrow Press Lanham, MD.
Drexler, K.E. (1986). Engines of creation: The coming era of nanotechnology, New York: Anchor Books; available free at http://e-drexler.com/p/06/00/EOC_Cover.html.
Garner, J., Porter, A.L. (to appear). Assessing the human and social dynamics program—exceptional cross-disciplinarity. In Proceedings of Atlanta conference on science and innovation policy 2011 (September 14-17). Atlanta, USA.
Garner, J., Porter, A.L., Newman, N.C., Crowl, T. (under revision), Assessing Research Network and Disciplinary Engagement Changes Induced by an NSF Program, Research Evaluation.
R Jurkovick JHP Paelincer eds. 1984 Problems in interdisciplinary studies Gow Publishing Aldershot, England.
Katz, J. S., Hicks, D. M. (1995). The classification of interdisciplinary journals: A new approach. In Proceedings of the fifth biennial conference of the international society for scientometrics and infometrics, Rosary College, ILL (pp. 245–255). Medford, NJ: Learned Information, Inc..
Klavans, R, Boyack, KW 2009 Toward a consensus map of science. Journal of the American Society for Information Science and Technology 60 3 455–476 .
Klein, JT 1996 Crossing boundaries: Knowledge, disciplinarities, and interdisciplinarities University Press of Virginia Charlottesville, VA.
Leydesdorff, L, Rafols, I 2009 A global map of science based on the ISI subject categories. Journal of the American Society for Information Science and Technology 60 2 348–362 .
Li, R, Meng, L 2010 On the framing of patent citations and academic paper citations in reflecting knowledge linkage: A discussion of the discrepancy of their divergent value-orientations. Chinese Journal of Library and Information Science 3 3 37–45.
Liu, YX, Rousseau, R 2010 Knowledge diffusion through publications and citations: A case study using ESI-fields as unit of diffusion. Journal of the American Society for Information Science and Technology 61 2 340–351.
MacGarvie, M 2005 The determinants of international knowledge diffusion as measured by patent citations. Economics Letters 87:121–126 .
Masse, L.C., Moser, R.P., Stokols, D., Taylor, B.K., Marcus, S.E., Morgan, G.D., Hall, K.L., Croyle, R.T., Trochim, W.M. (2008). Measuring collaboration and transdisciplinary integration in team science. American Journal of Preventive Medicine, 35 (2): S151-S160.
Moed, H 2010 Measuring contextual citation impact of scientific journals. Journal of Informetrics 4 3 265–277 .
National Academies - Committee on Science, Engineering, and Public Policy (COSEPUP) Committee on Facilitating Interdisciplinary Research (2005). Facilitating interdisciplinary research. Washington, DC: National Academies Press.
Porter, A.L., Rafols, I (2009b). Measuring and mapping interdisciplinarity in six research fields over time (1975-2005). In ISSI Conference, Rio de Janeiro, Brazil.
Porter, AL, Cohen, AS, Roessner, JD, Perreault, M 2007 Measuring researcher interdisciplinarity. Scientometrics 72 1 117–147 .
Porter, AL, Cunningham, S 1995 Whither nanotechnology? A bibliometric study. Foresight Update 21:12–15.
Porter, AL, Rafols, I 2009 Is science becoming more interdisciplinary? Measuring and mapping six research fields over time. Scientometrics 81 3 719–745 .
Porter, AL, Roessner, JD, Cohen, AS, Perreault, M 2006 Interdisciplinary research-meaning, metrics and nurture. Research Evaluation 15 3 187–195 .
Porter, AL, Roessner, JD, Heberger, AE 2008 How interdisciplinary is a given body of research?. Research Evaluation 17 4 273–282 .
Porter, AL, Schoeneck, DJ, Roessner, D, Garner, J 2010 Practical research proposal and publication profiling. Research Evaluation 19 1 29–44 .
Rafols, I, Leydesdorff, L 2009 Content-based and algorithmic classifications of journals: Perspectives on the dynamics of scientific communication and indexer effects. Journal of the American Society for Information Science and Technology 60 9 1823–1835 .
Rafols, I, Meyer, M 2010 Diversity and network coherence as indicators of interdisciplinarity: case studies in bionanoscience. Scientometrics 82 2 263–287 .
Rafols, I, Porter, AL, Leydesdorff, L 2010 Science overlay maps: A new tool for research policy and library management. Journal of the American Society for Information Science & Technology 61 9 1871–1887 .
Singh, J 2005 Collaborative networks as determinants of knowledge diffusion patterns. Management Science 51:756–770 .
Small, H 2010 Referencing through history: How the analysis of landmark scholarly texts can inform citation theory. Research Evaluation 19 3 185–193 .
Stirling, A 2007 A general framework for analysing diversity in science, technology and society. Journal of the Royal Society Interface 4 15 707–719 .
Stokols, D, Fuqua, J, Gress, J, Harvey, R, Phillips, K, Baezconde-Garbanati, L, Unger, J, Palmer, P, Clark, MA, Colby, SM, Morgan, G, Trochim, W 2003 Evaluating transdisciplinary science. Nicotine and Tobacco Research 5 Suppl. 1 S21–S39 .
Stolpe, M 2002 Determinants of knowledge diffusion as evidenced in patent data: the case of liquid crystal display technology. Research Policy 31 7 1181–1198 .
Wagner, CS, Roessner, JD, Bobb, K, Klein, JT, Boyack, KW, Keyton, J, Rafols, I, Borner, K 2011 Approaches to understanding and measuring interdisciplinary scientific research (IDR): A review of the literature. Journal of Informetrics 5 1 14–26 .
Yegros-Yegros, A., Amat, C., D;Este, P., Porter, A.L., Rafols, I. (2010, September). Does interdisciplinary research lead to higher impact? STI Conference (Science & Technology Indicators), Leiden.
Yu, G, Wang, MY, Yu, DR 2010 Characterizing knowledge diffusion of nanoscience & nanotechnology by citation analysis. Scientometrics 84 1 81–97 .
Zitt, M, Ramanana-Rahary, S, Bassecoulard, E 2005 Relativity of citation performance and excellence measures: From cross-field to cross-scale effects of field-normalisation. Scientometrics 63 2 373–401 .