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

Rank Field Papers Citations Citations/ Paper World Cites/Paper % +/- 1 Space Sciences 850 16,901 19.88 14.10 +41 2 Agricultural Sciences 1,689 13,430 7.95 6.73 +18 3 Physics 5,775 57,224 9.91 8.82 +12 4 Clinical Medicine 5,752 71,344 12.40 12.63 - 2 5 Engineering 5,365 22,443 4.18 4.43 - 6 6 Pharmacology 882 9,695 10.99 11.80 - 7 7 Plant/Animal Sciences 4,635 31,917 6.89 7.49 - 8 8 Materials Science 4,317 25,010 5.79 6.44 -10 9 Chemistry 8,398 76,503 9.11 10.61 -14 10 Geosciences 1,247 9,787 7.85 9.39 -16 11 Environment/Ecology 2,403 21,298 8.86 10.70 -17 12 Mathematics 2,076 5,695 2.74 3.34 -18 13 Neurosciences 1,074 14,909 13.88 19.07 -27 14 Immunology 437 6,638 15.19 21.50 -29 14 Microbiology 1,173 13,056 11.13 15.60 -29 16 Biochemistry 3,293 39,295 11.93 17.04 -30 16 Computer Science 1,873 4,509 2.41 3.45 -30 18 Molecular Biology 1,332 22,974 17.25 25.63 -33 19 Economics and Business 791 2,591 3.28 5.72 -43 20 Psychiatry/Psychology 514 2,884 5.61 10.74 -48 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.

Portugal ranks 34^th in output, 32^nd in citations received, and 22^nd 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 Portugal by relative citation impact, that is, citations per paper for Portugal in a field compared with the world’s citations per paper score in the same field. Portugal’s percentage above or below the world average is presented in the column at far right. Areas of strength for Portugal, according to this measure, are Space Sciences (including atmospheric sciences), Agricultural Sciences, and Physics. For more information on the Thomson Reuters Essential Science Indicators database, see: http://scientific.thomsonreuters.com/products/esi