Returns the Z estimator of Hill's diversity number. This is based on raising the Z estimator of Renyi's equivalent entropy to the 1/(r-1) power. When r=1 returns exp(H), where H is the Z estimator of Shannon's entropy. See Zhang and Grabchak (2014a) for details.
Vector of counts. Must be integer valued. Each entry represents the number of observations of a distinct letter.
Order of Renyi's equivalent entropy this index is based on. Must be a strictly positive real number.
Lijuan Cao and Michael Grabchak
Z. Zhang and M. Grabchak (2014a). Entropic representation and estimation of diversity indices. http://arxiv.org/abs/1403.3031.
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