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FIELD RANKINGS FOR USA, 1999-2009, BY RELATIVE CITATION IMPACT

Rank Field Papers Citations Citations/ Paper World Cites/Paper % +/- 1 Materials Science 72,334 815,404 11.27 6.44 +75 2 Computer Science 72,921 421,825 5.78 3.45 +68 3 Chemistry 229,330 4,070,208 17.75 10.61 +67 4 Physics 206,562 2,967,124 14.36 8.82 +63 5 Economics/Business 68,716 606,714 8.83 5.72 +54 6 Geosciences 88,854 1,236,760 13.92 9.39 +48 7 Mathematics 70,746 336,839 4.76 3.34 +43 8 Biochemistry 203,934 4,896,429 24.01 17.04 +41 8 Space Science 57,845 1,147,064 19.83 14.10 +41 10 Clinical Medicine 733,322 12,972,454 17.69 12.63 +40 10 Microbiology 55,128 1,204,468 21.85 15.60 +40 12 Engineering 201,534 1,241,424 6.16 4.43 +39 13 Agricultural Sciences 42,905 397,969 9.28 6.73 +38 14 Pharmacology 53,040 848,969 16.01 11.80 +36 15 Molecular Biology 124,679 4,265,213 34.21 25.63 +33 16 Plant/Animal Sciences 156,593 1,552,156 9.91 7.49 +32 17 Neurosciences 127,173 3,176,498 24.98 19.07 +31 18 Environment/Ecology 85,594 1,191,696 13.92 10.70 +30 19 Immunology 55,461 1,504,545 27.13 21.50 +26 20 Psychiatry/Psychology 124,948 1,621,763 12.98 10.74 +21 SOURCE: Thomson Reuters Essential Science Indicators, January 1999–December 2009

The data above were extracted from the Essential Science Indicators database of Thomson Reuters. The database, currently covering the period January 1999 through December 2009, surveys only journal articles (original research reports and review articles) indexed by Thomson Reuters. Articles are assigned to a category based on the journals in which they were published and the journal-to-category field definition scheme used by Thomson Reuters. Both articles tabulated and citation counts to those articles are for the period indicated.

The United States ranks 1^st in output, 1^st in citations received, and 2^nd – behind Switzerland - in citations per paper (among nations publishing 50,000 or more papers during the period) across the science and social science fields surveyed in Essential Science Indicators. The table above ranks fields for the United States by relative citation impact, that is, citations per paper for the United States in a field compared with the world’s citations per paper score in the same field. The United States’ percentage above or below the world average is presented in the column at far right. For more information on the Thomson Reuters Essential Science Indicators database, see: http://scientific.thomsonreuters.com/products/esi