Journal metrics allow comparison of journals for purposes of
There are many different metrics to measure and compare journals, though the Journal Impact Factor is the best know and most widely used. There are several tools where these metrics can be found.
The Eigenfactor score of a journal is an estimate of the percentage of time that library users spend with that journal. An Eigenfactor is based on the number of cited references, with citations from highly ranked journals weighted to make a larger contribution than those from poorly ranked journals. The Normalized Eigenfactor (NE) converts a journal's Eigenfactor into a multiplicative score centered around 1, such that, if a journal received an NE score of 2, it would be twice as influential as the average journal in the network.
Impact per publication measures the ratio of citations in a year to scholarly papers published in the three previous years divided by the number of scholarly papers published in those same years. The IPP metric is using a citation window of three years which is considered to be the optimal time period to accurately measure citations in most subject fields. Taking into account the same peer-reviewed scholarly papers only in both the numerator and denominator of the equation provides a fair impact measurement of the journal and diminishes the chance of manipulation.
The JIF Percentile expresses a journal's category rank as a percentile. By factoring in a journal's impact factor within its specific field, as well as controlling for the size of the field, the JIF Percentile allows normalized comparison between journals in different specialty areas. The metric also provides specific comparative data (based, as the name implies, on percentiles) on a journal’s standing in its own field.
The journal impact factor is a measure of the frequency that the "average article" published in a scholarly journal has been cited in a two or five year period. It is often used to measure or describe the importance of a particular journal in an academic discipline. Authors can use impact factors to evaluate journals to decide which to publish in.
The SCImago journal rank (SJR) metric measures the 'prestige' of a journal by both counting the number of citations a journal receives and the importance of the other journals in which those citations appear. It is inspired by Google's PageRank algorithm. It is a size-independent indicator and it ranks journals by their 'average prestige per article' and can be used for journal comparisons in science evaluation processes.
Source normalized impact per paper (SNIP) corrects for differences in publication rated among disciplines. It weighs citations to a journal based on the number of citations in that field. So disciplines with smaller publication rates can be compared to ones with higher rates. It's defined as the ratio of a journals citation count per paper and the citation potential (average length of lists of reference lists in a field) for the journals subject field.