Table 5-22
S&E articles, citations, and international citations, by selected region/country: 1998 and 2008
(Percent)
 
  Share of world articles   Share of world citations   Share of world/country/economy
citations that are international
Country/region 1998 2008   1998 2008   1998 2008
 
World 100.0 100.0   100.0 100.0   60.2 66.3
United States 34.0 28.9   46.9 38.3   46.9 51.8
EU 34.6 33.1   32.4 33.2   43.7 49.4
China 1.6 5.9   0.6 4.3   63.6 51.0
Japan 8.5 7.8   6.8 6.3   60.7 68.6
Asia-8 3.6 6.8   1.5 4.6   61.8 65.3
 

EU = European Union

NOTES: Article/citation counts from set of journals covered by Science Citation Index (SCI) and Social Sciences Citation Index (SSCI). Articles classified by year they entered database, rather than year of publication, and assigned to country/economy on basis of institutional address(es) listed on article. Articles on fractional-count basis, i.e., for articles with collaborating institutions from multiple countries/economies, each country/economy receives fractional credit on basis of proportion of its participating institutions. See appendix table 5-23 for countries/economies included in EU and Asia-8, which in this table are treated as single countries. Citation counts based on 3-year period with 2-year lag, e.g., citations for 1998 are references made in articles in 1998 data tape to articles in 1994–96 data tapes; data shown are for the 3 years in cited year window.

SOURCES: Thomson Reuters, SCI and SSCI, http://thomsonreuters.com/products_services/science/; The Patent BoardTM; and National Science Foundation, Division of Science Resources Statistics, special tabulations.

Science and Engineering Indicators 2010