nk- 1+nk-2
Calculation formula: IF(k) = Nk- 1+Nk-2.
Description:
K is a certain year, Nk- 1+Nk-2 is the number of papers published in the previous two years, and the number of cited articles of Nk- 1 and Nk-2 in K year. In other words, the impact factor of a journal in 2005 is the total cited figures published in 2004 and 2003 divided by the cited figures published in 2004 and 2000.
Question 2: Calculation method of impact factor The impact factor is calculated in years. Take 1992 as an example, if (1992) = A/B, where A = 1990 to 199 1 year, the number of times all articles in this journal are cited; B = the number of all articles in this journal from 1990 to 199 1. Influence Many famous academic journals will indicate their influence factors on their websites to show their influence in the corresponding disciplines. For example, Journal of American Chemical Society, Oncogenes, etc. Major universities in Chinese mainland (such as Tsinghua, China University of Science and Technology, Nankai, China Agricultural University, Jilin University, Harbin Institute of Technology, Zhejiang University, Shanghai University, Dalian University of Technology, etc.). ) all take the influence factors of academic journals as the main criteria for judging graduate students' graduation. Taking 1992 as an example, calculate the impact factors of a journal in the current year: X= based on 1992, the total number of papers cited in a journal in 1990 and 199 1 year, and Y= based on1year.
Question 3: How are the impact factors of magazines and periodicals generally calculated? The impact factor is calculated in years. Take the impact factor of a journal in 1992 as an example, if (1992) = A/B,
A = the number of times all articles in this journal were cited from 1990 to 199 1 in 1992;
B = the number of all articles in this journal from 1990 to 199 1.
affect
Many famous academic journals will indicate their influence factors on their websites to show their influence in the corresponding disciplines. For example, Journal of American Chemical Society, Oncogenes, etc. Major universities in Chinese mainland (such as Tsinghua, Harbin Institute of Technology and Zhejiang University) take the influence factors of academic journals as the main criteria for judging graduate students' graduation.
Question 4: How are the impact factors of Chinese core journals calculated? In fact, the calculation of the impact factor does not involve the number of articles in that year.
The calculation method is as follows: the number of articles cited in the first two years of this year (the first two years) is divided by the number of articles in the previous two years;
The immediacy index is related to the number of articles in that year, and its calculation method is to divide the number of articles cited in that year by the number of articles in that year.
Question 5: How to calculate the impact factors of journals? The impact factor of a periodical refers to the average number of citations in the previous two years. The higher the influence factor of a publication, the higher the citation rate of its published documents. On the one hand, it shows that the research results reported in these documents have great influence, on the other hand, it also reflects the high academic level of this publication.
Calculation method of impact factor
Impact factor is an internationally recognized index for periodical evaluation, which was put forward by E. Garfield in 1972. It is a macro scale to get an objective response to a document or a document, reflecting its importance. Because it is relative statistics, all kinds of periodicals can get fair evaluation and treatment. Usually, the greater the influence factor, the greater its academic influence and role. The specific algorithm is as follows:
Impact factor = (total number of papers published in the first two years of cited journals in statistical year)/(total number of papers published in the first two years of journals).
Question 6: How high is the impact factor? The influence factors are relative. The height greater than 2, the relative height greater than 1, depends on how you compare.
Question 7: How high is the impact factor? In 20 12, more than 150 academic journals in China (excluding Taiwan Province province) were included in SCI. The highest influencing factor was 10.526 (cell RES), and the influencing factor was >; 2 There are 15 species, 40 species between 1-2 and 50 species between 1-0.5. The level of the influence factor is relative, higher than 2 and higher than 1, depending on how you compare.
Question 8: How do you know the influencing factors of an article? Impact factor (IF) is a data in American ISI (institute for scientific information) JCR (Journal Citation Report).
That is, the total number of citations of papers published by a journal in the first two years of a statistical year divided by the total number of papers published by the journal in the first two years. This is an internationally accepted periodical evaluation index.
For example, the calculation of the impact factor of a journal in 2005.
Number of articles cited in 2005 and 2004: 48 Number of articles published in 2004: 187.
Number of articles cited in 2005 and 2003:128; Number of articles published in 2003: 154.
The total number of citations of papers from 2005 to 2003 was 176.
The total published volume of this journal in 2003-2004 was 34 1.
The impact factor of this journal in 2005: 0.5161=176 ? 34 1.
Significance: This index is a relative statistical value, which can overcome the deviation caused by different papers published in large and small journals. Generally speaking, the greater the influence factor, the greater its academic influence.
Attachment: calculation method of IF value (taking 1992 as an example)
All references in a = 1992 (specify records in the database)
B = 1992 The total number of citations of papers published in 1990 and 199 1.
C = 1990 and 199 1 year.
D (journal impact factor 1992) = b/c
Impact factor query system
emuch/sciif/
This address will do.
Protein omics /sci-if/
The answer comes from zhidao.baidu/...wtp=wk..
Question 9: What are the influencing factors of academic journals? Is the second author also an author? This should be analyzed in detail, because the impact factors of journals in different disciplines are very different. Generally speaking, domestic journals 1.0 or above are good, and those above 2.0 are rare. Whether the second author is an author depends on what title you are evaluating. Generally, it can be regarded as intermediate, but 2~3 second authors are equivalent to 1 first author. If it is rated as advanced, the second authors are basically not counted.