(1) paper factors, such as publication delay, length, type and quantity of collaborators.
(2) Periodical factors, such as periodical scale (number of published papers) and types.
(3) Subject factors, such as the number of journals in different disciplines, average citation times, citation half-life, etc., will have an impact on the impact factors and total citation frequency of journals.
(4) retrieval system factors, such as the sources of journals participating in statistics and the statistical scope of citation items.
(5) The influence of celebrity effect.
Extended data
The impact factor is the total number of articles cited by a magazine divided by the total number of articles in this magazine. But this figure is an average, and its problem is that the average does not reflect the citation of each article. If there are only two articles in a magazine, the number of citations of one article is 500, and the number of citations of the other article is 10, then the number reflected by the impact factor is the average of 255.
Therefore, a journal with high impact factor can only show that it has many papers cited many times, but it does not mean that every paper it publishes is highly cited.
According to the data, the journal impact factor calculated by Thomson Reuters Company was originally used to help librarians decide which journals to buy, and it is not an index to measure the scientific quality of research papers. In other words, the impact factor can be used to judge a journal, but it is useless to judge papers and extend them to scientists.
Baidu Encyclopedia-Influencing Factors
China News Network-Deputy Editor-in-Chief of Science: Do not use impact factors to evaluate scientists.