SNIP measures contextual citation impact by weighting citations based on the total number of citations in a subject field.
SJR is a prestige metric based on the idea that not all citations are the same. SJR uses a similar algorithm as the Google page rank; it provides a quantitative and a qualitative measure of the journal’s impact.
The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years.
© Thomson Reuters Journal Citation Reports 2015
To calculate the five year Impact Factor, citations are counted in 2014 to the previous five years and divided by the source items published in the previous five years.
© Journal Citation Reports 2015, Published by Thomson Reuters
Immunity is a monthly journal which publishes research articles and reviews of general interest in the entire discipline of immunology. Immunity was founded in the belief that advances in molecular and cellular immunology have brought immunology to a point at which a journal of high quality should be able to provide a unifying intellectual view, but the mandate for Immunity is not restricted to any particular level of analysis or to any particular type of system. The title*Immunity* is meant to indicate a breadth of interest extending beyond the formal definition of immunology, and into all systems that contribute to, or interact with, the immune system of the organism. Submitted articles are reviewed for both technical excellence and general interest, and those that are accepted are published within ten weeks.
Immunity follows the example of
Cell in defining criteria for general interest that are just as important as technical quality in deciding on the acceptability of submissions. The area of interest is defined broadly beyond the obvious characterization of immune genes and cells, effectively including any and all research that contributes to understanding of infection and host defenses. Practical consequences for clinical work are taken into account equally with advances in fundamental understanding.
Visit the Immunity website to find out more - http://www.immunity.com .