Field rankings for Spain

	Field	Papers	Citations	Citations per paper	World average	% +/–
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
%3D4	Chemistry	46,093	534,686	11.60	10.61	+9
%3D4	Engineering	22,401	107,776	4.81	4.43	+9
%3D6	Plant/animal sciences	22,174	173,462	7.82	7.49	+4
%3D6	Space science	7,397	108,558	14.68	14.10	+4
%3D8	Environment/ecology	10,386	109,455	10.54	10.70	–1
%3D8	Mathematics	11,463	37,667	3.29	3.34	–1
10	Clinical medicine	56,101	688,250	12.	12.63	–3
11	Geosciences	7,391	63,5	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

The data above were extracted from the Essential Science Indicators database of Thomson Reuters. The database, currently covering the period January 1999 to 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.

Spain ranks ninth in output, 11th in citations received and 23rd in citations per paper among nations publishing 50,000 or more papers during the period across the science and social science fields surveyed. The table above ranks fields for Spain by relative citation impact, that is, citations per paper in a field compared with world citations per paper score in the same field. Spain’s percentage above or below the world average is presented in the column at the far right. Exceptional areas of strength are physics, agricultural sciences, materials science, chemistry and engineering.

For further information, see: http://scientific.thomsonreuters.com/products/esi