Applied to irregular time series, Higuchi's fractal dimension estimato
r is considered as one of the most efficient one, According to Higuchi
(Physica D 31 (1988) 277-283), this estimator is based on the length
of the series, This paper exhibits some ambiguities about this interpr
etation and shows that for most generally used signals, this estimator
does not use signal length but properties of its increments. (C) 1998
Elsevier Science B.V. All rights reserved.