This year * * * nearly 13000 journals have obtained impact factors, and more than 60% of them have achieved the growth of IF.

The highest influencing factor is still CA, an oncology journal for clinicians, but it has dropped a lot this year, from 508.702 to 286.38+030.

The highest impact factor of domestic journals is Cell Research, with the latest IF of 46.297, ranking first in China.

Nature and science are 69.504 and 63.7 14 respectively. The largest increase (absolute value) of IF is in The Lancet, from 79.323 to 202.438+0.

Journal impact factor (IF) is a quantitative index representing the influence of journals. That is to say, the average number of citations of each paper in a journal is actually the ratio of the number of citations of all papers published in a journal in the first two years of a certain year to the number of citations of all source papers published in the journal in the first two years.

K is one year, Nk- 1+Nk-2? Total number of papers published in k- 1 and k-2, n k- 1? What about nk-2? Number of citations of this journal in k years. In other words, the impact factor of a journal in 2005 is the total number of cited papers published in 2004 and 2003 divided by the total number of papers published in 2004 and 2003 (citable papers).