G-index

G-index

The "g"-index is an index for quantifying the scientific productivity of physicists and other scientists based on their publication record. It was suggested in 2006 by Leo Egghe.

The index is calculated based on the distribution of citations received by a given researcher's publications.:"Given a set of articles ranked in decreasing order of the number of citations that they received, the g-index is the (unique) largest number such that the top g articles received (together) at least g2 citations."

An alternative definition is:"Given a set of articles ranked in decreasing order of the number of citations that they received, the g-index is the (unique) largest number such that the top g articles received on average at least g citations."

This index is very similar to the h-index, and attempts to address its shortcomings. Like the h-index, the g-index is a natural number and thus lacks in discriminatory power. Therefore, Richard Tol proposed a rational generalisation.

Tol also proposed a successive g-index.:"Given a set of researchers ranked in decreasing order of their g-index, the g1-index is the (unique) largest number such that the top g1 researchers have on average at least a g-index of g1."

ee also

* h-index
* h-b index

References

* Egghe, L. (2006) Theory and practice of the g-index, Scientometrics, vol. 69, No 1, pp. 131-152. [http://dx.doi.org/10.1007/s11192-006-0144-7 DOI link]
* Tol, R.S.J. (2008) A rational, successive g-index applied to economics departments in Ireland, Journal of Informetrics, vol. 2, pp. 149-155. [http://ideas.repec.org/p/sgc/wpaper/147.html preprint]


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