The e-index, complementing the h-index for excess citations.

<h4>Background</h4>The h-index has already been used by major citation databases to evaluate the academic performance of individual scientists. Although effective and simple, the h-index suffers from some drawbacks that limit its use in accurately and fairly comparing the scientific outp...

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Autor principal:	Chun-Ting Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2009
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/15113c26eda945e0ab0e3610fd76137a
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spelling	oai:doaj.org-article:15113c26eda945e0ab0e3610fd76137a2021-11-25T06:22:51ZThe e-index, complementing the h-index for excess citations.1932-620310.1371/journal.pone.0005429https://doaj.org/article/15113c26eda945e0ab0e3610fd76137a2009-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/19415119/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>The h-index has already been used by major citation databases to evaluate the academic performance of individual scientists. Although effective and simple, the h-index suffers from some drawbacks that limit its use in accurately and fairly comparing the scientific output of different researchers. These drawbacks include information loss and low resolution: the former refers to the fact that in addition to h(2) citations for papers in the h-core, excess citations are completely ignored, whereas the latter means that it is common for a group of researchers to have an identical h-index.<h4>Methodology/principal findings</h4>To solve these problems, I here propose the e-index, where e(2) represents the ignored excess citations, in addition to the h(2) citations for h-core papers. Citation information can be completely depicted by using the h-index together with the e-index, which are independent of each other. Some other h-type indices, such as a and R, are h-dependent, have information redundancy with h, and therefore, when used together with h, mask the real differences in excess citations of different researchers.<h4>Conclusions/significance</h4>Although simple, the e-index is a necessary h-index complement, especially for evaluating highly cited scientists or for precisely comparing the scientific output of a group of scientists having an identical h-index.Chun-Ting ZhangPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 4, Iss 5, p e5429 (2009)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Chun-Ting Zhang The e-index, complementing the h-index for excess citations.
description	<h4>Background</h4>The h-index has already been used by major citation databases to evaluate the academic performance of individual scientists. Although effective and simple, the h-index suffers from some drawbacks that limit its use in accurately and fairly comparing the scientific output of different researchers. These drawbacks include information loss and low resolution: the former refers to the fact that in addition to h(2) citations for papers in the h-core, excess citations are completely ignored, whereas the latter means that it is common for a group of researchers to have an identical h-index.<h4>Methodology/principal findings</h4>To solve these problems, I here propose the e-index, where e(2) represents the ignored excess citations, in addition to the h(2) citations for h-core papers. Citation information can be completely depicted by using the h-index together with the e-index, which are independent of each other. Some other h-type indices, such as a and R, are h-dependent, have information redundancy with h, and therefore, when used together with h, mask the real differences in excess citations of different researchers.<h4>Conclusions/significance</h4>Although simple, the e-index is a necessary h-index complement, especially for evaluating highly cited scientists or for precisely comparing the scientific output of a group of scientists having an identical h-index.
format	article
author	Chun-Ting Zhang
author_facet	Chun-Ting Zhang
author_sort	Chun-Ting Zhang
title	The e-index, complementing the h-index for excess citations.
title_short	The e-index, complementing the h-index for excess citations.
title_full	The e-index, complementing the h-index for excess citations.
title_fullStr	The e-index, complementing the h-index for excess citations.
title_full_unstemmed	The e-index, complementing the h-index for excess citations.
title_sort	e-index, complementing the h-index for excess citations.
publisher	Public Library of Science (PLoS)
publishDate	2009
url	https://doaj.org/article/15113c26eda945e0ab0e3610fd76137a
work_keys_str_mv	AT chuntingzhang theeindexcomplementingthehindexforexcesscitations AT chuntingzhang eindexcomplementingthehindexforexcesscitations
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The e-index, complementing the h-index for excess citations.

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