Impact Factor, h-index, i10-index and i20-index of Webology (ref).
The h-index is short for the Hirsch index, which was introduced by Jorge E. Hirsch (2005) as a way to quantify the productivity and impact of an individual author. Similar to how the IF is now be used to measure a journal or an author to their scientific field, the h-index has become another measure of relative impact of scientific publications. While the IF is derived from the quotient of total citations and total papers in a two-year span, the h-index is simply a count of the largest number of papers (h) from a journal or author that have at least (h) number of citations (ref).
The impact factor (IF) of a scientific journal is a measure reflecting the average number of citations to papers published in that journal. This indicator measures the relative importance of a journal within its scientific field, with journals with higher impact factors deemed to be more important than those with lower ones. The impact factor was devised by Eugene Garfield, the founder of the Institute for Scientific Information (ISI) in Philadelphia (now a part of Thomson Reuters), as a way to count the impact of scientific journals (ref).
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