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| Contemporary h-Index× | e-Index (Excess Citations)× | |
|---|---|---|
| Campo | Bibliometria | Bibliometria |
| Famiglia | Process / pipeline | Process / pipeline |
| Anno di origine≠ | 2007 | 2009 |
| Ideatore≠ | Antonis Sidiropoulos, Dimitrios Katsaros & Yannis Manolopoulos | Chun-Ting Zhang |
| Tipo≠ | Age-discounted author impact index | Author-level excess-citation impact index |
| Fonte seminale≠ | Sidiropoulos, A., Katsaros, D., & Manolopoulos, Y. (2007). Generalized Hirsch h-index for disclosing latent facts in citation networks. Scientometrics, 72(2), 253-280. DOI ↗ | Zhang, C.-T. (2009). The e-index, complementing the h-index for excess citations. PLoS ONE, 4(5), e5429. DOI ↗ |
| Alias | hc-index, time-weighted h-index, age-decayed h-index | Zhang e-index, excess citation index, e index |
| Correlati | 3 | 3 |
| Sintesi≠ | The contemporary h-index, introduced by Sidiropoulos, Katsaros, and Manolopoulos in 2007, modifies Hirsch's h-index to reward recent scientific activity over old laurels. The plain h-index never decreases and treats a citation earned decades ago the same as one earned last year, so a researcher who has stopped publishing can coast on an aging body of work. The contemporary index assigns each paper an age-discounted score, multiplying its citation count by a factor that shrinks as the paper grows older, and then applies the usual h-index ranking criterion to these scores. The result distinguishes currently active, recently impactful researchers from those whose reputation rests on distant achievements. | 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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