Total cites. The total number of times that a journal has been cited by all journals included in the database in the JCR year.
Citations to journals listed in JCR are compiled annually from the JCR years combined database, regardless of which JCR edition lists the journal and regardless of what kind of article was cited or when the cited article was published. Each unique article-to-article link is counted as a citation.
Citations from a journal to an article previously published in the same journal are compiled in the total cites. However, some journals listed in JCR may be cited-only journals, in which case self-cites are not included.
(Adapted from InCites Journal Citation Reports Glossary.)
Self-citations. A self-citation is a reference to an article from the same journal. Self-citations can make up a significant portion of the citations a journal gives and receives each year. You can compare self-citing rates and self-cited rates to supplement your journal evaluation. (Adapted from InCites Journal Citation Reports Glossary.)
Citable items. Not all items published in a journal are counted as “citable.” “Citable items” are “substantive, scholarly items,” such as original research articles, review articles, reviews, and commentary, not news items, editorials, or other non-research material. Only “citable items” figure into the calculation of the Journal Impact Factor. (See McVeigh & Mann, 2009.)
% Articles in citable items. The metric “% of Articles in Citable Items” indicates the extent to which a journal focuses on original research by calculating the percentage of articles that count toward the total Citable Items. For example, in 2013, Nature has 829 articles and 28 reviews, for a total Citable Items of 857. This means that 96% of the Citable Items are original research. (Adapted from InCItes Journal Citation Reports Glossary.)
Citing half-life is the median age of articles cited by the journal in the JCR year. (From InCites Journal Citation Reports Glossary.) Not to be confused with Cited Half-Life, which refers to the age of citations to this journal.
Article influence score. The Article Influence Score determines the average influence of a journal's articles over the first five years after publication. It is calculated by multiplying the Eigenfactor Score by 0.01 and dividing by the number of articles in the journal, normalized as a fraction of all articles in all publications. This measure is roughly analogous to the 5-Year Journal Impact Factor in that it is a ratio of a journal’s citation influence to the size of the journal’s article contribution over a period of five years.
The mean Article Influence Score for each article is 1.00. A score greater than 1.00 indicates that each article in the journal has above-average influence. A score less than 1.00 indicates that each article in the journal has below-average influence.
Normalized eigenfactor. The Normalized Eigenfactor Score is the Eigenfactor score normalized by rescaling the total number of journals in the JCR each year, so that the average journal has a score of 1. Journals can then be compared and influence measured by their score relative to 1. For example, if a journal has a Normalized Eigenfactor Score of 5, that journal is considered to be 5 times as influential as the average journal in the JCR. (From InCItes Journal Citation Reports Glossary.)