preseqR.interpolate.rSAC | 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 j = 1,2,…; and the second column is N_j, the number of species with each species represented exactly j times in the initial sample. The first column must be sorted in an ascending order. |
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)
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