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Publication Metrics: Journal Metrics

What are the metrics for journals?

The impact factor is a measure of the frequency with which the average article in a journal has been cited in a particular year.
The Journal Citation Report also lists journals and their impact factors and ranking in the context of their specific field(s).

Read more about the journal impact factor on the Metrics Toolkit.impact factor image

eigenfactor image

The eigenfactor score is a journal-level metric that measures the number of times, in the past five years, that articles from a journal have been cited in the Journal Citation Reports (JCR). The Eigenfactor score considers which journals have contributed these citations and removes journal self-citations. Like the impact factor, the eigenfactor score is essentially a ratio of number of citations to total number of articles. Eigenfactor metrics differ from impact factors, because the former both counts citations as well as takes into account the location from which the citations appear.  

The eigenfactor score:

  • Counts citations to journals in both the sciences and social sciences.
  • Eliminates self-citations. Every reference from one article in a journal to another article from the same journal is discounted.
  • Weights each reference according to a stochastic measure of the amount of time researchers spend reading the journal.

The SNIP (source normalized impact per paper) indicator measures the average citation impact of the publications of a journal. Unlike the journal impact factor, SNIP corrects for differences in citation practices between scientific fields, thereby allowing for more accurate between-field comparisons of citation impact. It measures contextual citation impact by weighting citations based on the total number of citations in a subject field, using Scopus data.

 

The SJR (SCImago Journal and Country Rank) is a journal-level metric that uses citation data from Scopus to provide journal impact data. It also provides rankings by journal country of origin and numerous visual representations of journal impact data. The ranking method is based on the Google PageRank algorithm. With SJR, the subject field, quality and reputation of the journal has a direct effect on the value of a citation. 

How to Find Journal Impact

1. Go to Journal Citation Reports, type in the name of the journal and select the matching title from the dropdown list.

Journal Citation Reports image

2. The resulting page shows impact factor for the most recent year, trends, and the impact factor calculation.

Journal Citation Reports image

1. Go to the Eigenfactor Journal Ranking search.

Eigenfactor image

2. The resulting page shows the Eigenfactor score (EF) and the Article Influence (AI) score.

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1. Go to Scopus.

2.Click on Sources above the search box.

Scopus image

3. Type in the name of the journal and select it from the dropdown list that appears as you type. Click on Find sources.

4. The source details provides metrics about the journal, including SNIP, SJR, and CiteScore.

Scopus image

1. Go to Scopus.

2.Click on Sources above the search box.

Scopus image

3. Type in the name of the journal and select it from the dropdown list that appears as you type. Click on Find sources.

4. The source details provides metrics about the journal, including SNIP, SJR, and CiteScore.

Scopus image

Resources for Journal Impact