Impact factor (IF), that is, the total number of citations of papers published by a journal in the first two years of the reporting year (JCR year) divided by the total number of papers published by the journal in these two years. The impact factor has become a general index of periodical evaluation in the world. It is not only an index to measure the usefulness and exhibition of periodicals, but also an important index to measure the academic level of periodicals and even the quality of papers. The influence factor is a relative statistic. Huasheng medical compilation answers for you, hope to adopt!