SpEst.Chao1.abun: Species richness estimation
In RSE: Number of Newly Discovered Rare Species Estimation

Description Usage Arguments Author(s) References Examples

Chao1 estimator of species richness

1	SpEst.Chao1.abun(f)

`f`	A vector of species frequency counts, i.e., the number of singleton species (only one individual observed in the sample), the number of doubleton species (two individuals observed in the sample), and so forth.

Youhua Chen & Tsung-Jen Shen

Chao A. 1984. Non-parameteric estimation of the number of classes in a population. Scandinavian Journal of Statistics 11:265-270

## As an example, Herpetological assemblage data are used here.		
data(HerpetologicalData)
## two columns represent two samples of species abundance data
X.merge = HerpetologicalData
## the first column is treated as the original sample
Xi = X.merge[,1]
## Convert species abundance data to species frequency counts data
f = X.to.f(Xi)
SpEst.Chao1.abun(f=f)