iNEXT (version 2.0.3)

EstSimpson: Estimation of Simpson index

Description

EstSimpson Estimation of Simpson index via Good. (1953) and Chao et al. (2014)

Usage

EstSimpson(x, datatype = "abundance", transform = FALSE, conf = 0.95,
  B = 200)

Arguments

x

a vector of species frequence

datatype

the data type of input data. That is individual-based abundance data (datatype = "abundance") or sample-based incidence data (datatype = "incidence").

transform

a logical constant to compute traditional index or the effective transformation. Default is logical=FALSE.

conf

a positive number $\le$ 1. "conf" specifies the confidence level for confidence interval. The default is 0.95.

B

the number of bootstrap resampling times, default is 200.

Value

• a value of species richness estimator

See Also

ChaoSpecies, ChaoEntropy

Examples

data(spider)
EstSimpson(spider$Girdled, datatype="abundance")