What are the JCR and SJR?

JCR (Journal Citation Reports) and SJR (SCImago Journal Rank) are two tools used to measure the impact and quality of academic journals. Both provide quantitative tools for ranking, rating, ranking and comparing journals. However, they use different methods and metrics to calculate their rankings.

• Journal Citation Reports (JCR)

JCR is a product of Clarivate Analytics and provides a method for evaluating and comparing scientific journals. The JCR uses an impact factor (IF) to measure how often the “average article” in a journal is cited in a given year or period.

 The impact factor is calculated as the number of citations of articles published in the previous two years in the current year divided by the number of articles published in the same two years. For example, if a journal has an impact factor of 5, it means that its articles have been cited an average of 5 times.

 It is important to note that the impact factor only applies to journals or groups of journals, not to individual articles or individual researchers.

• SCImago magazine rating (SJR)

SJR is a measure of the prestige of scientific journals, which takes into account both the number of citations to the journal and the prestige of the journals from which the citations originate. The SJR indicator is a numerical value that represents the weighted average of the citations received in the selected year for the document published in the relevant journal during the three previous years.

SJR uses a complex method based on the PageRank algorithm, which takes into account the ranking of the reference magazine when calculating references. This means that citations from more prestigious journals carry more weight and have a greater impact on the cited journal’s SJR.

Like JCR, SJR also provides quartile values (Q1, Q2, Q3, Q4) that rank journals from highest to lowest based on their impact factor or impact index. The most respected magazines in the subject are in Q1.

• JCR vs. SJR

Although both JCR and SJR are used to measure journal quality, there are some key differences:

• JCR is a paid tool accessible through the Web of Science platform, while SJR is free and its citation database (Scopus) is a paid service.

• JCR uses a two-year reference period to calculate its impact factor, while SJR uses a three-year reference period.

• The JCR effect factor gives equal weight to all citations, while the SJR indicator weighs citations based on the evaluation of the citation journal.

In summary, both JCR and SJR provide valuable metrics for evaluating and comparing scientific journals, although they do so using different methods. It is important to understand these differences when interpreting their rankings.