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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/9750

Title: Empirical series of journal h-indices: The JCR category Horticulture as a case study
Authors: Liu, Yuxian
Rao, I. K. Ravichandra
ROUSSEAU, Ronald
Issue Date: 2009
Publisher: SPRINGER
Citation: SCIENTOMETRICS, 80(1). p. 59-74
Abstract: Two types of series of h-indices for journals published in the field of Horticulture during the period 1998-2007 are calculated. Type I h-indices are based on yearly data, while type II h-indices use cumulative data. These h-indices are also considered in a form normalised with respect to the number of published articles. It is observed that type I h-indices, normalised or not, decrease linearly over a period of ten years. The type II series, however, is not linear in nature: it exhibits partly a concave shape. This proves that the journals (in Horticulture) do not exhibit a linear increase in h-index as argued by Hirsch in the case of life-time achievements of scientists. In the second part of the paper, an attempt is made to study the relative visibility of a journal and its change over time, based on h-indices of journals. It is shown that: the h-index over the complete period 1998-2007 of the journal Theoretical & Applied Genetics (h = 62) is much higher than that of all other journals in the field the relation between the number of publications and the type II h-index for the whole period is not an exact power law (as it would have to be if the Egghe-Rousseau model were applicable) in order to study the dynamic aspects of journal visibility, a field-relative normalised h-ratio is defined to monitor systematic changes in the field of Horticulture. Except for two journals, the Pearson correlation coefficient for yearly values of this field-relative normalised h-ratio indicates that there is no systematic change of the performance of the journals with respect to the field as a whole.
Notes: [Liu, Yuxian] Lib Tongji Univ, Catalogue Sect, Shanghai 200092, Peoples R China. [Liu, Yuxian] RV Coll, Indian Stat Inst, Calcutta 560059, W Bengal, India. [Rao, I. K. Ravichandra] Univ Hasselt, B-3590 Diepenbeek, Belgium. [Rousseau, Ronald] KHBO Assoc KU Leuven, B-8400 Oostende, Belgium.
URI: http://hdl.handle.net/1942/9750
DOI: 10.1007/s11192-007-2026-z
ISI #: 000267368100004
ISSN: 0138-9130
Category: A1
Type: Journal Contribution
Validation: ecoom, 2010
Appears in Collections: Research publications

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