STM publisher Elsevier, Netherlands, has announced the highlights of its journal Impact Factor performance in 2009. Elsevier saw over 65 percent of its journal Impact Factors (IFs) increase from 2008 to 2009. According to the 2009 Journal Citation Reports published by Thomson Reuters, Elsevier journals took the #1 position in 57 of 230 categories (up from 51 of 229 last year) across all of the sciences and social sciences.
This year there were 95 Elsevier journals that increased their IF by more than 50 percent over their 2008 scores. Amongst the biggest movers are journals in energy & fuels, climate change, sustainable development and banking & finance.
The Lancet and all three Lancet specialty journals improved their IFs this year. The Lancet's IF reached 30.758, ranking it 2nd in the Medicine, General & Internal category. The Lancet Neurology increased by 27 percent to 18.126, retaining its position as top-ranked journal in the Clinical Neurology category for the 6th consecutive year. The Lancet Infectious Diseases increased to 15.583, also retaining its position as top-ranked journal in its category of Infectious Diseases for the 6th consecutive year. The Lancet Oncology rose to 14.470, ranking it 5th of 165 journals in the Oncology category.
Cell, the flagship journal of Cell Press, remains the number one research journal in the Cell Biology and Biochemistry & Molecular Biology subject categories, with an Impact Factor of 31.152. Cell Press journals Cell Stem Cell and Cell Host and Microbe also saw their Impact Factors surge. In addition, 62 Elsevier journals earned their first IF this year.
The impact factor is a measure of the frequency with which the average article in a journal has been cited in a particular year. The impact factor helps to evaluate a journal's relative importance, especially when compared with others in the same field.
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