674 research outputs found
The revised SNIP indicator of Elsevier's Scopus
The modified SNIP indicator of Elsevier, as recently explained by Waltman et
al. (2013) in this journal, solves some of the problems which Leydesdorff &
Opthof (2010 and 2011) indicated in relation to the original SNIP indicator
(Moed, 2010 and 2011). The use of an arithmetic average, however, remains
unfortunate in the case of scientometric distributions because these can be
extremely skewed (Seglen, 1992 and 1997). The new indicator cannot (or hardly)
be reproduced independently when used for evaluation purposes, and remains in
this sense opaque from the perspective of evaluated units and scholars.Comment: Letter to the Editor of the Journal of Informetrics (2013; in press
Hyperincursive Cogitata and Incursive Cogitantes: Scholarly Discourse as a Strongly Anticipatory System
Strongly anticipatory systems-that is, systems which use models of themselves
for their further development-and which additionally may be able to run
hyperincursive routines-that is, develop only with reference to their future
states-cannot exist in res extensa, but can only be envisaged in res cogitans.
One needs incursive routines in cogitantes to instantiate these systems. Unlike
historical systems (with recursion), these hyper-incursive routines generate
redundancies by opening horizons of other possible states. Thus, intentional
systems can enrich our perceptions of the cases that have happened to occur.
The perspective of hindsight codified at the above-individual level enables us
furthermore to intervene technologically. The theory and computation of
anticipatory systems have made these loops between supra-individual
hyper-incursion, individual incursion (in instantiation), and historical
recursion accessible for modeling and empirical investigation.Comment: arXiv admin note: substantial text overlap with arXiv:1011.324
How are new citation-based journal indicators adding to the bibliometric toolbox?
The launching of Scopus and Google Scholar, and methodological developments
in Social Network Analysis have made many more indicators for evaluating
journals available than the traditional Impact Factor, Cited Half-life, and
Immediacy Index of the ISI. In this study, these new indicators are compared
with one another and with the older ones. Do the various indicators measure new
dimensions of the citation networks, or are they highly correlated among them?
Are they robust and relatively stable over time? Two main dimensions are
distinguished -- size and impact -- which together shape influence. The H-index
combines the two dimensions and can also be considered as an indicator of reach
(like Indegree). PageRank is mainly an indicator of size, but has important
interactions with centrality measures. The Scimago Journal Ranking (SJR)
indicator provides an alternative to the Journal Impact Factor, but the
computation is less easy
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