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") or
sampling-unit-based incidence data (datatype = "incidence").
conf
a positive number $\le$ 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.