An H-index gives a general indication on the number of publications an author has authored and and number of times each of their publication has been cited. A high H-index generally indicates a great overall impact and wealth of publications of an author within their given field.
An H-index of 20 means that 20 of an author's publications have been cited 20 or more times.
Impact Factor is the average number of citations generated from articles published in a journal from a given year. It is one method used to compare the significance of the impact of different journals within the field.
The Eigenfactor is another metric used to compare the significance of journals within the field. It differs from the Impact Factor in that it citations from higher ranked journals positively affect the eigenfactor of a journal more so than citations in lower ranked journals.
Often, when deciding where to publish research (e.g. a chapter of a thesis) these two factors may be consulted.
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