The Subject Category page provides essential JCR data about a subject category.
Each journal indexed in JCR is assigned to at least one subject category, indicating a general area of science or the social sciences. Journals may be included in more than one subject category; therefore, when comparing journals across related categories, it is possible to see the same journal title in different categories.
Total Cites
The total number of citations to journals in the subject category in the JCR year.
Median Impact Factor
The median value of all journal impact factors in the subject category.
Aggregate Impact Factor
The impact factor of the category, based on aggregated journal data. Click the number to get more information about this measure.
Aggregate Immediacy Index
The immediacy index of the subject category, based on aggregated journal data. Click the number to get more information about this measure.
Aggregate Cited Half-Life
The cited half-life of the category, based on aggregated journal data. Click the number to get more information about this measure.
Aggregate Citing Half-Life
The citing half-life of the category, based on aggregated journal data. Click the number to get more information about this measure.
# Journals
The number of journals in the category.
Total Articles
The total number of articles published in the JCR year in all journals in the category. Articles are citable items; that is, they include reviews as well as research articles. Click the Source Data link for more detailed source data.
Cited Category 
Click the link to view the Aggregate Cited Category Graph. Click the Cited Category Data button to view the Cited Category Table.
Citing Category
Click the link to view the Aggregate Citing Category Graph. Click the Citing Category Data button to view the Citing Category Table .
Publication Frequency
Click the link to get an overview of the publication frequency of journals in the category.
Related Journals
Click the button to view related journals.
Scope Note
Click the button to view subject category scope notes.
View Journal Summary List
Click the button to view the list of journals in the subject category.
Frequency of publication data categorize the journals in the subject category according to their publication schedule. Subject categories that have a large number of frequently published journals tend to have a high immediacy index.
| Frequency | Number of issues per year |
| Annual | 1 |
| Semiannual | 2 |
| Triennial | 3 |
| Quarterly | 4 |
| Bimonthly | 5-8 |
| Monthly | 9-14 |
| Biweekly | 15-24 |
| Weekly | One issue per week |
| Irregular | Irregular publication schedule |
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