The Standardized Journal Citation Metric (SJCM) is a standardized citation metric used in the Academic Journal Guide (AJG) to make journals comparable across disciplines. It compensates for discipline-specific differences in citation behavior by dividing raw citation rates by the field average—similar to SNIP, but adapted specifically for AJG to ensure fair evaluations.

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Calculation:

SCJM = (citations per paper in the journal) / (average citations per paper in the field)

The Journal Impact Factor (JIF), also known as the Impact Factor, is a bibliometric indicator that measures the average citation frequency of articles in a scientific journal and thus evaluates its influence within a subject area. It is primarily used to compare journals with each other, not individual articles or authors, and is published annually by Clarivate Analytics in the Journal Citation Reports (JCR). It is updated once a year and can only be accessed with a valid Web of Science license.

Advantages:

The JIF is standardized, transparent, and well-established, enabling quick comparisons within narrow subject categories and often correlating with a journal's visibility and prestige.

Disadvantages:

The JIF is not a measure of quality for individual articles, as citations are unevenly distributed (a few articles drive up the value) and discipline-specific differences are ignored (e.g., higher values in the life sciences). Criticisms include manipulation (e.g., maximizing reviews, minimizing editorials), self-citations, time delays, and discrimination against interdisciplinary or non-English-language journals.

Calculation:

(Citations in one year to publications published in the last two years) /

(Number of citable items in the last two years)

CiteScore is a metric provided by Elsevier based on information from its Scopus publication database. CiteScore calculates the average citation frequency per document in a journal. It is derived from the ratio of citations a journal receives in a given year (e.g., 2022) for publications from the previous four years (e.g., 2018–2021) to the total number of documents published during that period.

The Journal Impact Factor (JIF) quartiles are a classification of scientific journals based on their impact factor within a subject category. They divide all journals in a discipline into four equal groups (quartiles) to show the relative position of a journal compared to its competitors. Quartiles provide a simple classification of whether a journal belongs to the leading, middle-tier, or lower-tier publications in a subject area.

The Eigenfactor Score is a bibliometric indicator used to evaluate the influence of scientific journals based on the frequency and significance of citations. Unlike the traditional Journal Impact Factor, the Eigenfactor weights citations according to the relevance of the citing source: citations from renowned and frequently cited journals count more than those from less influential titles.

The Eigenfactor Score reflects a journal's overall contribution to scientific discourse by taking into account both the volume (number of articles) and quality of citations. It is therefore useful for comparing journals of different sizes and publication frequencies.

Eigenfactor scores are less manipulable than the JIF because they take into account citation origin and network properties, giving greater weight to the influence of renowned journals.

Normalized Eigenfactor:

The normalized Eigenfactor, often referred to as the Article Influence Score (AIS), normalizes the Eigenfactor to the average impact per article. The total Eigenfactor is divided by the number of articles in the journal and normalized to a mean value of 1.0. An AIS greater than 1.0 means that the articles in this journal have an above-average impact, while an AIS less than 1.0 means that they have a below-average impact.

The normalized Eigenfactor therefore allows for better comparability of journals of different sizes or publication strategies and complements the Impact Factor, as it gives greater weight to citation quality.

The SCImago Journal Rank (SJR) is a freely accessible bibliometric indicator for evaluating the scientific prestige of academic journals, which measures the average number of weighted citations per document. Citations are weighted differently depending on the source. The subject area, quality, and reputation of the journal have a direct influence on the value of a citation. Unlike most indicators, the SJR can also be applied to journals, book series, and conference proceedings.

Calculation:

(Average number of weighted citations per year) / (Number of documents published in the last three years)

The Field-Weighted Citation Impact (FWCI) is a normalized bibliometric indicator that measures how often publications (articles, books, conference papers) are cited compared to the global average for their field. It takes into account differences in discipline, publication type, and age to enable fair comparisons. The FWCI is not freely accessible.

Similar documents are those that come from the same subject area, are of the same type (e.g., article, letter, review), and are of the same age. An FWCI of 1 means that the publication performs exactly as expected compared to the global average. A value greater than 1 means that the publication is cited more often than would be expected based on the global average, and vice versa.

Calculation:
(Number of citations a document has received) / (Expected number of citations for similar documents)

Example:
A value of 1.48 means that the publication was cited 48% more often than expected.

The Source Normalized Impact per Paper (SNIP) is a bibliometric indicator that measures the citation impact of scientific journals by normalizing discipline-specific differences in citation practices. Developed by the Centre for Science and Technology Studies (CWTS) at Leiden University and based on Scopus data from Elsevier, SNIP enables fair comparisons between journals in different subject areas, as citations from fields with low citation frequency are weighted more heavily. The impact of a single citation is greater in subject areas where citations are less frequent, and vice versa. Stability intervals provide information about the reliability of the evaluation. Smaller journals tend to have larger stability intervals than larger journals. SNIP is available free of charge.

Calculation:

(Number of citations per article in the journal) / (Citation potential in your subject area)

• JIF Rank
• JIF Percentile
• Five-Year Journal Impact Factor
• Five-Year Journal Impact Factor Quartile
• JIF without Journal Self Citations
• Immediacy Index
• JCI (Journal Citation Indicator)
• JCI Rank
• JCI Quartile
• JCI Percentile
• Article Influence Score (AIS)
• AIS Quantile
• AIS Rank
• Total Citations
• Total Articles
• Citable Items
• % of Articles in Citable Items
• Cited Half-Life
• Citing Half-Life