Eigenfactor Scores are typically used in an effort to quantify the influence of a journal as compared to other journals.
Eigenfactor Scores are a journal level metric.
Eigenfactor Scores are based on the weighted number of citations in a given year to citable publications published in the journal within the 5 preceding years. Citations from publications published in more prestigious journals will receive greater weight than those from less prestigious journals. Self citations (e.g., an article from Journal A citing another article in Journal A) are excluded from the calculation. The sum of all all journals' Eigenfactor Scores is equal to 100.
For additional information on how the Eigenfactor Score is calculated, see Eigenfactor Score and Article Influence Score: Detailed Methods.
Note: Eigenfactor Scores are only available for journals indexed in Journal Citation Reports (JCR). Additionally, Eigenfactor Scores will be based only on citing publications in JCR. (i.e., citations from publications that are not in JCR will not be factored into Eigenfactor Scores).
For example, The Journal of Amazing Examples (JAE) has an Eigenfactor Score of 1.2 in 2015. This means that publications published in JAE in 2010, 2011, 2012, 2013, and 2014 cumulatively received 1.2% of the total influence of all publications indexed in Journal Citation Reports (JCR).
For reference, the top 100 journals in the Eigenfactor.org database had a 2015 Eigenfactor Score between 0.114 and 1.814.
You can find a journal's Eigenfactor Score on Eigenfactor.org or in Journal Citation Reports (JCR). Note that Eigenfactor.org is publicly accessible.
Finding a journal's Eigenfactor Score on Eigenfactor.org
Note: There is also a column that displays the EF score as a percentile (to the right of the journal name). The higher the percentile, the higher the Eigenfactor ranking.
Finding a journal's Eigenfactor Score on Journal Citation Reports (JCR)
Like any impact metric, Eigenfactor Scores have their limitations. Some of these limitations include:
For an in-depth look into how the Eigenfactor Score is calculated, see:
For an overview of the Eigenfactor Score, see:
About the Eigenfactor Project: FAQ. Eigenfactor.org. Accessed April 8, 2022. http://www.eigenfactor.org/about.php
For an overview of different metrics types, including the Eigenfactor Score, see:
Murphy LS, Kraus CK, Lotfipour S, Gottlieb M, Langabeer JR 2nd, Langdorf MI. Measuring scholarly productivity: A primer for junior faculty. Part III: Understanding publication metrics. West J Emerg Med. 2018 Nov;19(6):1003-1011. doi: 10.5811/westjem.2018.9.38213. Epub 2018 Oct 18. PMID: 30429933; PMCID: PMC6225941.
For a look into journal citation cartels (which can manipulate journal level metrics, including Eigenfactor Scores) see:
Kojaku S, Livan G, Masuda N. Detecting anomalous citation groups in journal networks. Scientific Reports. 2021 Jul;11(1). doi:10.1038/s41598-021-93572-3.