Computes the Chao 1 species richness estimator

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Description

Computes the Chao 1 richness estimator, its estimated variance, and the corresponding 95

Usage

1
   chao1(x)

Arguments

x

Vector of species abundances.

Details

Different equations are used to compute the classic Chao1 richness estimator, its estimated variance, and the corresponding 95

Value

A data frame with five columns including the observed number of species (Sobs), the estimated number of species with the Chao 1 estimator (S.chao1), the estimated variance (var), and the upper and lower 95

Author(s)

Luis Cayuela

References

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

See Also

specpool

Examples

1
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   abund <- c(19, 12, 7, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1)
   print(chao1(abund))