title: A rejoinder on energy versus impact indicators.
abstract: 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.
authors.forename: Loet
authors.initials: L
authors.lastname: Leydesdorff
authors.forename: Tobias
authors.initials: T
authors.lastname: Opthof