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Published online on November 7, 2005, 10.1073/pnas.0507655102
PNAS | November 15, 2005 | vol. 102 | no. 46 | 16569-16572


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PHYSICS
An index to quantify an individual's scientific research output

J. E. Hirsch *

Department of Physics, University of California at San Diego, La Jolla, CA 92093-0319

Communicated by Manuel Cardona, Max Planck Institute for Solid State Research, Stuttgart, Germany, September 1, 2005 (received for review August 15, 2005)

I propose the index h, defined as the number of papers with citation number ≥h, as a useful index to characterize the scientific output of a researcher.

citations | impact | unbiased

Author contributions: J.E.H. designed research, performed research, analyzed data, and wrote the paper.

{dagger} Of course, the database used must be complete enough to cover the full period spanned by the individual's publications.

{ddagger} This was first introduced in the SPIRES database.

* E-mail: jhirsch{at}ucsd.edu.

© 2005 by The National Academy of Sciences of the USA


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