Research hotspot - Official publicity! The release time of JCR zoning and impact factors will be determined in 2022!

According to the latest news on Kerui Weian's official website ,2022 year JCR Zoning and impact factors will be set at 2022 year 6 month 30 Early morning 2:00 Release , When the EA-ISET association Will synchronize updates JCR List of zones and impact factors , If necessary, please pay attention to the official account “ Eurasian academic ”, The backstage replies to receive ！

Screenshot of the source ： Official website of Kerui Weian

Under what circumstances was such a remarkable influence factor born ？ What are the stories ？ Let's take a look at the past and present lives of the influencing factors .

What are the influencing factors ？

Influencing factors （Impact Factor）, abbreviation IF, It is a journal citation report produced by Kerui Weian （Journal Citation Reports,JCR） A piece of data in . That is, the papers published by a journal in the previous two years in the report year （JCR year） Divided by the total number of citations in the journal published in the previous two years Article and Review total .

The impact factor has now become the international general journal evaluation index , It is not only an index to measure the usefulness and display of periodicals , It is also a measure of the academic level of journals , And even an important indicator of paper quality .

Influence factor previous life

50 The mid - , Dr. Garfield tried to create an index that can measure the influence of a single journal based on citation data . His original goal , It is to highlight the influence of Periodicals Based on citations , To help librarians and administrators establish and maintain library collections .

The Institute for Scientific Information（ISI） The founder of Eugene Garfield Think , Such an indicator can help librarians see which academic journals are worth subscribing to , because “ The more frequently journal articles are cited , It increasingly implies that the global scientific research community believes that this journal carries a lot of useful information .”

Twenty years later , This idea has yielded fruitful results , As SCI Component part , Journal Citation Report （Journal Citation Reports,JCR） On 1975 First published in , Journal influencing factors （Journal Impact Factor） It's also on the stage .JCR Each year, the citation data of the previous year's worldwide journals are provided , give SCI/SSCI Influencing factors of journals .

The influencing factors are now

How to calculate the influence factor ？

The impact factor is the current status of articles in the first two years of the journal JCR The total number of citations obtained in is the same as that published in the previous two years Article and Review The ratio of the total number .

The calculation formula is as follows ：

Focus on ： All from Web of Science The citations of the core set are used to calculate the molecules of the influence factors , But only by Web of Science Scientific Citation Index in （SCIE） And Social Science Citation Index （SSCI） Only the journals included will issue the impact factors .

Numerator and denominator

molecular ： The total number of citations of all papers published in the first two years of the journal in that year . The number of citations obtained for any document type will be taken into account , Besides ,JCR The special algorithm of the will also collect citations that cannot be linked to a particular journal due to incomplete or incorrect metadata in the original reference .

The denominator ：Web of Science In the core collection “ A research paper ”（Article） and “ review ”（Review）. Types of literature that are not normally cited , Like correspondence （Correspondence） Or edit the material （Editorial material） Is not included in the denominator of the influence factor .

No influence factor can be SCI Included

The answer is yes , First of all, periodicals should be included before , There will be influence factors .

Journals without impact factors exist , The absence of an impact factor does not mean that a journal is an informal journal .

If it is a new publication , There may be no influence factor , For example, a journal that has been published for less than three years has no impact factor , We can't say that such publications are illegal .

In addition to new publications , There are also some cases where the publication has no impact factors , For example, the quality of periodicals cannot be maintained , The self citation rate of periodicals is too high , Or the journals can not meet the standard operating procedures, etc , Will result in no impact factors for journals .

At the end ： The influence factor is only one of the reference indexes which are widely used at present , Not the only , Please also take a correct and reasonable attitude towards journal impact factors .