Egghe, L (Egghe, L.) The influence of merging on h-type indices JOURNAL OF INFORMETRICS, 2 (3): 252-262 JUL 2008

[Eugene Garfield]

E-mail Address: leo.egghe at uhasselt.be 

Author(s): Egghe, L (Egghe, L.) 

Title: The influence of merging on h-type indices 

Source: JOURNAL OF INFORMETRICS, 2 (3): 252-262 JUL 2008 


Language: English 

Document Type: Article 

Author Keywords: merging; h-index; g-index; R-index; weighted h-index 

Abstract: Each information production process has a unique h-index. This 
paper studies the problem: what are possible h-index values if we merge 
two or more IPPs?

First the paper gives examples of IPP mergings. There are at least two 
types: one where common sources add their number of items and one where 
common sources get the maximum of their number of items in the two IPPs.
In each case we show that
max(h(1), h(2)) <= h <= h(1) + h(2)
for both types of mergings (h(i), i = 1, 2 the h-index in the two IPPs; h 
is the h-index in the merged one).
We show that the above inequalities cannot be improved ( in both merging 
types).
We also show that the same inequalities are true for the g-index and the R-
index but that they are false for the weighted h-index. For the R-index we 
can even refine the above inequality
R <= root R-1(2) + R-2(2) < R-1 + R-2. (C) 2008 Elsevier Ltd. All rights 
reserved. 

Addresses: Univ Antwerp, B-2000 Antwerp, Belgium; Univ Hasselt UHasselt, B-
3590 Diepenbeek, Belgium 

Reprint Address: Egghe, L, Univ Antwerp, Stadscampus,Venusstraat 35, B-
2000 Antwerp, Belgium. 

E-mail Address: leo.egghe at uhasselt.be 

Cited Reference Count: 11 

Times Cited: 0 

Publisher: ELSEVIER SCIENCE BV 

Publisher Address: PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS 

ISSN: 1751-1577 

DOI: 10.1016/j.joi.2008.06.002 

29-char Source Abbrev.: J INFORMETR 

ISO Source Abbrev.: J. Informetr. 

Source Item Page Count: 11 

Subject Category: Information Science & Library Science 

ISI Document Delivery No.: 327ZQ 

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