Google Scholar Metrics provide an easy way for authors to quickly gauge the visibility and influence of recent articles in scholarly publications. Scholar Metrics summarize recent citations to many publications, to help authors as they consider where to publish their new research.
Journal Citation Reports® offers a systematic, objective means to critically evaluate the world's leading journals, with quantifiable, statistical information based on citation data. By compiling articles' cited references, JCR helps to measure research influence and impact at the journal and category levels, and shows the relationship between citing and cited journals. Available in Science and Social Sciences editions.
SJR is a measure of scientific influence of scholarly journals that accounts for both the number of citations received by a journal and the importance or prestige of the journals where such citations come from. It is a variant of the eigenvector centrality measure used in network theory. Such measures establish the importance of a node in a network based on the principle that connections to high-scoring nodes contribute more to the score of the node.
Author Impact Metrics: the h-index
A measure of both the productivity and publication impact of an entity, which depends on both the number of publications and the number of citations they have received.
Known as Hirsch's h-index, the h-index measures both quantity and impact of an individual's scientific research output. It can be calculated in Web of Science, Scopus, Google Scholar and other online services.The h-index is defined by how many (h) of a researcher’s publications have at least (h)citations each. An author with an h-index of 10 has at least 10 publications with 10 citations each.