Estimation of species richness

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Description

ChaoRichness: estimation of species richness based on the methods proposed in Chao (1984, 1987)

Usage

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ChaoRichness(x, datatype = "abundance", conf = 0.95)

ChaoSpecies(x, datatype = "abundance", conf = 0.95)

Arguments

x

a vector of species abundances or incidence frequencies. If datatype = "incidence", then the first entry of the input data must be total number of sampling units, followed by species incidence frequencies.

datatype

data type of input data: individual-based abundance data (datatype = "abundance"), sampling-unit-based incidence frequencies data (datatype = "incidence_freq") or species by sampling-units incidence matrix (datatype = "incidence_raw").

conf

a positive number 1 specifying the level of confidence interval.

Value

A vector of observed species richness, species richness estimate, s.e. and the associated confidence interval.

References

Chao, A. (1984) Nonparametric estimation of the number of classes in a population. Scandinavian Journal of Statistics, 11, 265-270.

Chao, A. (1987) Estimating the population size for capture-recapture data with unequal catchability. Biometrics, 43, 783-791.

See Also

ChaoShannon, ChaoSimpson

Examples

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data(spider)
ChaoRichness(spider$Girdled, datatype="abundance")