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
Immunology and Allergy Clinics of North America updates you on the latest trends in patient management; keeps you up to date on the newest advances; and provides a sound basis for choosing treatment options. Each issue focuses on a single topic in immunology and allergy and is presented under the direction of an experienced guest editor. Topics include allergens, immunotherapy, anaphylaxis, asthma, drug allergy, eosinophilrelated disorders, food allergy, immunodeficiency states (non-HIV), basic science, mast cell disorders, rhinitis and sinusitis, and urticaria and angioedema. Immunology and Allergy Clinics of North America is published four times each year, in February, May, August, and November.