Quantitative analysis of journals is a way traditional peer review may be augmented to gain a more complete picture of a scholar's impact in his chosen field. Three measures can be used:
Knowing the impact or importance of the journal can help in decisions about where an author will choose to submit an article.
As an alternative to using impact factors from the Journal Citation Reports, many new sites have appeared on the Internet using other metrics.
An impact factor is a way of measuring the relative ranking of a journal within a particular field. Ranked lists of journals can be used to:
The Journal Impact Factor is the average number of times articles from the journal published in the past two years have been cited in the JCR year.
The Impact Factor is calculated by dividing the number of citations in the JCR year by the total number of articles published in the two previous years. An Impact Factor of 1.0 means that, on average, the articles published one or two year ago have been cited one time. An Impact Factor of 2.5 means that, on average, the articles published one or two year ago have been cited two and a half times. The citing works may be articles published in the same journal. However, most citing works are from different journals, proceedings, or books.