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

Rank  Field Papers Citations Citations/  Paper World Cites/Paper % +/- 1 Physics 28,646 317,344 11.08 8.82 +26 2 Agricultural Sciences 12,424 98,594 7.94 6.73 +18 3 Materials Science 11,684 82,759 7.08 6.44 +10 4 Chemistry 46,093 534,686 11.60 10.61 + 9 4 Engineering 22,401 107,776 4.81 4.43 + 9 6 Plant/Animal Sciences 22,174 173,462 7.82 7.49 + 4 6 Space Science 7,397 108,558 14.68 14.10 + 4 8 Environment/Ecology 10,386 109,455 10.54 10.70 - 1 8 Mathematics 11,463 37,667 3.29 3.34 - 1 10 Clinical Medicine 56,101 688,250 12.27 12.63 - 3 11 Geosciences 7,391 63,275 8.56 9.39 - 9 12 Pharmacology 5,061 52,170 10.31 11.80 -13 13 Microbiology 7,528 97,036 12.89 15.60 -17 14 Molecular Biology 8,096 170,304 21.04 25.63 -18 15 Biochemistry 16,349 226,765 13.87 17.04 -19 16 Neuroscience 9,387 142,319 15.16 19.07 -21 17 Immunology 3,514 57,834 16.46 21.50 -23 18 Computer Science 9,791 24,938 2.55 3.45 -26 19 Economics/Business 4,994 20,204 4.05 5.72 -29 20 Psychiatry/Psychology 6,260 36,663 5.86 10.74 -45 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.

Spain ranks 9^th in output, 11^th in citations received, and 23^rd 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 Spain by relative citation impact, that is, citations per paper for Spain in a field compared with the world’s citations per paper score in the same field. Spain’s percentage above or below the world average is presented in the column at far right. Exceptional areas of strength for Spain, according to this measure, are Physics, Agricultural Sciences, Materials Science, Chemistry, and Engineering. For more information on the Thomson Reuters Essential Science Indicators database, see: http://scientific.thomsonreuters.com/products/esi