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Chao2 Estimator

Usage

index_chao2(x, ...)

# S4 method for matrix
index_chao2(x, unbiased = FALSE, improved = FALSE, ...)

Arguments

x

A \(m \times p\) matrix of presence/absence data (incidence).

...

Currently not used.

unbiased

A logical scalar: should the bias-corrected estimator be used?

improved

A logical scalar: should the improved estimator be used?

Value

A numeric vector.

References

Chao, A. (1987). Estimating the Population Size for Capture-Recapture Data with Unequal Catchability. Biometrics 43(4), 783-791.

Chiu, C.-H., Wang, Y.-T., Walther, B. A. & Chao, A. (2014). An improved nonparametric lower bound of species richness via a modified good-turing frequency formula. Biometrics, 70(3), 671-682. doi:10.2307/2531532 .

Author

N. Frerebeau