ChaoRichness
: estimation of species richness based on the methods proposed in Chao (1984, 1987)
1 2 3  ChaoRichness(x, datatype = "abundance", conf = 0.95)
ChaoSpecies(x, datatype = "abundance", conf = 0.95)

x 
a vector of species abundances or incidence frequencies. If 
datatype 
data type of input data: individualbased abundance data ( 
conf 
a positive number ≤ 1 specifying the level of confidence interval. 
A vector of observed species richness, species richness estimate, s.e. and the associated confidence interval.
Chao, A. (1984) Nonparametric estimation of the number of classes in a population. Scandinavian Journal of Statistics, 11, 265270.
Chao, A. (1987) Estimating the population size for capturerecapture data with unequal catchability. Biometrics, 43, 783791.
ChaoShannon, ChaoSimpson
1 2  data(spider)
ChaoRichness(spider$Girdled, datatype="abundance")

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