preseqR.interpolate.rSAC {preseqR} | R Documentation |
Interpolating the number of species represented at least r
times
in a subsample given an initial sample
preseqR.interpolate.rSAC(n, ss, r=1)
n |
A two-column matrix.
The first column is the frequency |
ss |
A positive double equal to the step size between subsamples. |
r |
A positive integer. Default is 1 |
The expected number of species represented at least r
times in the subsample is estimated based on an expended version of the
formula by Heck Jr, KL. et al. (1975).
A two-column matrix for the number of species represented at least r
times in a random sample. The first column is the size of the random sample;
the second column is the expected number of species represented at least r
times in the sample.
NULL if failed.
Chao Deng
Heck Jr, K. L., van Belle, G., & Simberloff, D. (1975). Explicit calculation of the rarefaction diversity measurement and the determination of sufficient sample size. Ecology, 1459-1461.
## load library
library(preseqR)
## import data
data(Shakespeare)
## The expected number of distinct words represented twice or more in the
## subsample
preseqR.interpolate.rSAC(n=Shakespeare, ss=1e5, r=2)