e-Index (Excess Citations)
The e-index, proposed by Chun-Ting Zhang in 2009, isolates the citations that the h-index throws away. Inside the h-core of an author's h most-cited papers, the h-index implicitly credits each paper with only h citations and discards everything above that, even though top papers may have far more. The e-index recovers exactly this surplus: it is the square root of the difference between the total citations of the h-core and the h-squared citations that the h-index already accounts for. Zhang designed it as a complement rather than a replacement for the h-index, so that the pair (h, e) together describe both the size of an author's productive core and the concentration of excess impact within it.
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Kilder
- Zhang, C.-T. (2009). The e-index, complementing the h-index for excess citations. PLoS ONE, 4(5), e5429. DOI: 10.1371/journal.pone.0005429 ↗
- Hirsch, J. E. (2005). An index to quantify an individual's scientific research output. Proceedings of the National Academy of Sciences, 102(46), 16569-16572. DOI: 10.1073/pnas.0507655102 ↗
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ScholarGate. (2026, June 23). e-Index (Zhang's Excess-Citation Complement to the h-Index). ScholarGate. https://scholargate.app/no/bibliometrics/e-index
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- g-Index (Egghe)Bibliometri↔ sammenlign
- hg-Index (Composite Hirsch-Egghe)Bibliometri↔ sammenlign
- i10-IndexBibliometri↔ sammenlign
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