| num.samples.required {sprex} | R Documentation |
Number of Samples Required
Description
Calculate the additional number of samples to required to observe a given proportion of the total number of species.
Usage
num.samples.required(g, f, f0.func, ...)
Arguments
g |
propotion of total number of species. |
f |
a vector of species frequencies where |
f0.func |
a function that computes the number of unobserved species (f0). |
... |
other arguments to |
Value
a vector containing of the estimated additional number of samples
(m.g) required to observe g percent of the total number
of species.
Author(s)
Eric Archer eric.archer@noaa.gov
References
Eqn 12 in Chao, A., R.K. Colwell, C.-W. Lin, and N.J. Gotelli. 2009.
Sufficient sampling for asymptotic minimum species richness estimators.
Ecology 90(4):1125-1133.
Eqn 11 in Colwell, R.K., A. Chao, N.J. Gotelli, S.-Y. Lin,
C.X. Mao, R.L. Chazdon, and J.T. Longino. 2012. Models and estimators
linking individual-based and sample-based rarefaction, extrapolation and
comparison of assemblages. Journal of Plant Ecology 5(1):3-21.
Examples
data(osa.old.growth)
f <- expand.freqs(osa.old.growth)
num.samples.required(0.6, f = f, f0.func = Chao1)