According to the Journal Citation Reports, the journal has a 2009 impact factor of 4. 174, ranking it first among 255 journals in the category " Mathematics ".
According to the Journal Citation Reports, the journal has a 2011 impact factor of 4. 736, ranking it 21th out of 131 journals in the category " Ecology " and 10th out of 45 journals in the category " Evolutionary Biology ".
According to the Journal Citation Reports, the journal's 2011 impact factor is 9. 681.
According to the Journal Citation Reports, the journal has a 2011 impact factor of 2. 123, ranking it 15th out of 62 journals in the category " Health Policy & Services ", 27th out of 76 journals in the category " Health Care Sciences & Services ", and 36th out of 320 journals in the category " Economics ",
According to the Journal Citation Reports, the journal has a 2011 impact factor of 11. 452, ranking it first in the category ' Biology '.
According to the Journal Citation Reports, the journal has a 2011 impact factor of 30. 026, ranking it third out of 153 journals in the category " Medicine, General & Internal ".
According to the Journal Citation Reports, the journal has a 2011 impact factor of 1. 971.
According to the Journal Citation Reports, the journal has a 2011 impact factor of 5. 415.
According to the Journal Citation Reports, the journal has a 2011 impact factor of 0. 841.
According to the Journal Citation Reports, the journal has a 2011 impact factor of 4. 900, ranking it 9th out of 56 journals in the category " Astronomy & Astrophysics ".
According to the Journal Citation Reports, the journal has a 2011 impact factor of 0. 274, ranking it 29th out of 37 journals in the category " Social Issues ".
According to the Journal Citation Reports, the journal had a 2008 impact factor of 0. 804.
According to the Journal Citation Reports, the journal has a 2011 impact factor of 0. 720.
According to the Journal Citation Reports, the journal has a 2009 impact factor of 1. 758, ranking it 10th among 255 mathematics journals.
According to the Journal Citation Reports, the journal's 2011 impact factor is 8. 026.
According to the Journal Citation Reports, the journal has a 2011 impact factor of 13. 608.
According to the Journal Citation Reports, the journal has a 2011 impact factor of 0. 779, ranking it 8th out of 50 journals in the category " History and Philosophy of Science " ( Science edition ) and 7th out of 36 journals in the same category in the Social Sciences edition.
According to the Journal Citation Reports, the journal has a 2010 impact factor of 2. 056.
According to the Journal Citation Reports, the journal has a 2011 impact factor of 5. 920, ranking it second out of 320 journals in the category " Economics ".
According to the Journal Citation Reports, the journal has a 2011 impact factor of 2. 517.
According to the Journal Citation Reports, the journal has a 2010 impact factor of 1. 691, ranking it 37th out of 108 journals in the category " Computer Science, Artificial Intelligence ".
According to the Journal Citation Reports, the journal has a 2009 impact factor of 3. 613, ranking it second out of 41 journals in the category " Paleontology ".
According to the Journal Citation Reports, the journal has a 2010 impact factor of 1. 170.
According to the Journal Citation Reports, the journal has a 2011 impact factor of 0. 471, ranking it 90th among 124 journals in the category " Psychology, Multidisciplinary " and 55th among 89 journals in the category " Social Sciences, Interdisciplinary ".
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