How to calculate the influencing factors in recent five years?

Divide the total citations of papers published in the first five years of the journal by the number of papers published in the first five years of the journal.

The influence factor is the total number of citations (U) x (the total number of citations in the previous two years) of a journal in a statistical year divided by the total number of papers published in the previous two years (S, T) y (the total number of papers published in the previous two years). This is an internationally accepted periodical evaluation index. The formula is: IFU? =(X(S，T)？ / Y(S，T)).

For example, the calculation of impact factor of 20 10 journal:

1, 20 10, 2009 articles cited times: 48; Publication of this journal in 2009: 187.

2. The number of citations of articles in this journal in 2008 was 2010:128; Publication of this journal in 2008: 154.

3. The total number of citations of articles published in this journal on October 20, 2008-2009 is 176 =(48+ 128).

4. The total published volume of this journal in 2008-2009 is 341= (187+154).

5. The impact factor of this journal in 20 10 years: 0.5161= (176 ÷ 341).

meaning

Impact factors are not the most objective criteria for evaluating the influence of periodicals.

Generally speaking, the higher the impact factor, the greater the influence of the journal. For some comprehensive or important research fields, the citation rate is relatively high because of the wide range of research fields. For example, biological and chemical journals are generally more likely to have higher influence.

Although the impact factor can represent the academic quality to some extent, there is no linear proportional relationship between the impact factor and the academic quality. For example, it cannot be said that a journal with an impact factor of 5.0 is necessarily better than a journal with an impact factor of 2.0, and the impact factor does not have the function of accurately and quantitatively evaluating academic quality.