Per Thomson Reuters, the JCR provides quantitative tools for ranking, evaluating, categorizing, and comparing journals. The impact factor is one of these; it is a measure of the frequency with which the "average article" in a journal has been cited in a particular year or period. The annual JCR impact factor is a ratio between citations and recent citable items published. Thus, the impact factor of a journal is calculated by dividing the number of current year citations to the source items published in that journal during the previous two years
Calculation for journal impact factor. A= total cites in 1992 B= 1992 cites to articles published in 1990-91 (this is a subset of A) C= number of articles published in 1990-91 D= B/C = 1992 impact factor
The SCImago Journal & Country Rank (SJR) is a public portal that includes the journals and country scientific indicators developed from the information contained in the Scopus® database. These indicators can be used to assess and analyze scientific domains. Journals can be compared or analysed separately. Country rankings may also be compared or analysed separately. Journals can be grouped by subject area, category or country. Citation data is drawn from over 21,500 titles from more than 5,000 international publishers and country performance metrics from 239 countries worldwide.
Traditional Metrics H-Index H-Index = number of papers (h) with a citation number ≥ h. Example: a research with an H-Index of 24 has 24 papers cited at least 24 times.
The h-index is an author-level metric that attempts to measure both the productivity and citation impact of the publications of a scientist or scholar. The index is based on the set of the scientist's most cited papers and the number of citations that they have received in other publications. What's the difference between H and G? click here
Tools for measuring H-Index: Web of Science Google Scholar G-Index Developed in 2006, Leo Egghe proposed the G-Index in his paper "Theory and Practice of the G-Index". G-Index builds on and improves the H-Index. It is not as widely accepted as the H-Index.
i10-Index Created by Google Scholar and used in Google's My Citations feature. i10-Index = the number of publications with at least 10 citations.
Altmetrics is a quantitative measure of the quality and quantity of attention that a scholarly work is receiving through social media, citations, and article downloads. Mendeley, ImpactStory, Altmetric.com, Publish or Perish, PlumX.
Another citation search software program is, Publish or Perish, a free software program that analyzes data from Google Scholar. Publish or Perish has the same advantages and disadvantages as Google Scholar, with the added feature of deeper analysis. To download the new version of Publish or Perish 7, click the link above and select New Publish or Perish 7. Here you will find instructions on how to download the free software to your PC or Mac.