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Chao1 Estimator

Usage

index_chao1(x, ...)

# S4 method for numeric
index_chao1(x, unbiased = FALSE, improved = FALSE, na.rm = FALSE, ...)

Arguments

x

A numeric vector of count data (absolute frequencies).

...

Currently not used.

unbiased

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

improved

A logical scalar: should the improved estimator be used?

na.rm

A numeric scalar: should missing values (including NaN) be removed?

Value

A numeric vector.

References

Chao, A. (1984). Nonparametric Estimation of the Number of Classes in a Population. Scandinavian Journal of Statistics, 11(4), 265-270.

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:10.1111/biom.12200 .

Author

N. Frerebeau