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影响因子的概念及其计算公式是由美国科技信息研究所所长加菲尔德(E.Garfield)于1972年提出来的,具体计算公式为:IF(k)=(n(k-1)+n(k-2))/(N(k-1)+N(k-2))。式中:k表示年份;(N(k-1)+N(k-2))
The concept of the influencing factor and its calculation formula were proposed by E. Garfield, director of the Institute of Scientific and Technical Information of the United States in 1972. The specific formula is: IF (k) = (n (k-1) + n (k-2)) / (N (k-1) + N (k-2)). Where: k represents the year; (N (k-1) + N (k-2))