Rygg's index of diversity is given by
SN = ln(S)/(ln(ln(N)))
The adjusted version of Rygg's index which gives more consistent values
S=2, N=2, N=3 and
S=3, N=3 is
SN = ln(S)/(ln(ln(N+1)+1))
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data in a
taxa names (
Rygg's index of diversity (
vector of length 1)
rygg_: version suitable for calling from a function
(see package lazyeval).
Rygg's index is not defined for N=exp(1). For
N <= exp(1),
Rygg, B. (2006). Developing indices for quality-status classification of marine soft-bottom fauna in Norway. Norwegian Institute for Water Research, Oslo, Norway. NIVA Report SNO 5208-2006.
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