skewed citation distributions should not be averaged

Loet Leydesdorff loet at LEYDESDORFF.NET
Wed Aug 31 02:10:13 EDT 2011

A Rejoinder on Energy versus Impact Indicators
Scientometrics (in press)

Citation distributions are so skewed that using the mean or any other
central tendency measure is ill-advised. Unlike G. Prathap's scalar measures
(Energy, Exergy, and Entropy or EEE), the Integrated Impact Indicator (I3)
is based on non-parametric statistics using the (100) percentiles of the
distribution. Observed values can be tested against expected ones; impact
can be qualified at the article level and then aggregated. 


pdf available at 


** apologies for cross postings


Loet Leydesdorff 

Professor, University of Amsterdam
Amsterdam School of Communications Research (ASCoR)
Kloveniersburgwal 48, 1012 CX Amsterdam.
Tel. +31-20-525 6598; fax: +31-842239111

 <mailto:loet at> loet at ;
Visiting Professor,  <> ISTIC,
Beijing; Honorary Fellow,  <> SPRU, University
of Sussex 


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