The h-index and m-index

Michael Schwartzbach has written a web application to compute the h-index and m-index of an author, using data from Google Scholar. The terms come from Hirsch 2005, which defines h-index as follows:

A scientist has index h if h of his/her N papers have
at least h citations each, and the other (N − h) papers
have no more than h citations each.

The m-index is given by h/n, where n is the number of years the scientist has been publishing papers. Jens Palsberg maintains a list of computer scientists with h-index of at least 40.

FYI: There is a useful online tool to calculator an individual scientist's H-index, using Google Scholar database.

H-index calculator of scientist impact
The web site you mention is just another interface to Schwartzbach's implementation.
Publish or Perish is a software program that retrieves and analyzes academic citations and provides a wide range of citation metrics, including the h-index. It allows users to review both cited articles and citations in order to correct potential citation errors. It is free for non-profit use.

Page link: http://www.harzing.com/pop.htm

See also Reflections on the h-index and Reflections on Google Scholar for a discussion of the validity, assumptions, and limitations of the underlying sources and methods used by Publish or Perish.
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