A higher level. The impact factor is an internationally accepted evaluation index, that is, the total number of citations of papers published in the first two years of a journal in a statistical year divided by the number of papers published in the first two years of the journal. This is a relative statistic, which can objectively reflect the influence and position of the journal in the discipline. In fact, the level of impact factors depends on the periodical group, subject field and publication time. Journals with an impact factor greater than 5 are considered as high-impact journals, so the impact factor is 3.