chao.sd {fossil} | R Documentation |
Computes the standard error for chao1
or chao2
chao.sd(x)
x |
a vector of abundances or frequencies of occurrences |
primarily designed to be used internally by spp.est
to calculate the
errors for the chao estimators
returns a value for standard deviation for chao1
or chao2
Matthew Vavrek
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.
## sample vector
a<-c(0,5,1,1,2,0,0,1,0,0,8,45)
chao.sd(a)