chao.sd {fossil}

Chao's estimation of standard error

Description

Computes the standard error for chao1 or chao2

Usage

chao.sd(x)

Arguments

x

a vector of abundances or frequencies of occurrences

Details

primarily designed to be used internally by spp.est to calculate the errors for the chao estimators

Value

returns a value for standard deviation for chao1 or chao2

Author(s)

Matthew Vavrek

References

Colwell, R.K. 2010. EstimateS: Statistical estimation of species richness and shared species from samples. Version 8.2. User's Guide and application published at: http://purl.oclc.org/estimates.

See Also

chao1, spp.est

Examples

## sample vector
a<-c(0,5,1,1,2,0,0,1,0,0,8,45)
chao.sd(a)