calc_chao1 estimates the number of species at the asymptote
S_asymp) of the species accumulation curve based on the methods
proposed in Chao (1984, 1987, 2005).
a vector of species abundances or a site-by-species matrix
This function is a trimmed version of
T. C. Hsieh, K. H. Ma and Anne Chao are the original authors of the
a vector of species richness estimates
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.
Chao, A. (2005) Species estimation and applications. Pages 7907<e2><80><93>7916 in N. Balakrishnan, C. B. Read, and B. Vidakovic, editors. Encyclopedia of statistical sciences. Second edition, volume 12. Wiley, New York, New York, USA.
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