Description Usage Arguments Details Author(s) References Examples
Various functions connected to Fisher's logseries including creation of synthetic datasets and estimation of Fisher's alpha
1 2  fishers.alpha(N, S, give=FALSE)
fisher.ecosystem(N, S, nmax, alpha=NULL, c=0)

N 
Size of the ecosystem. In the case of

S 
Number of species in ecosystem 
alpha 
In function 
give 
In function 
nmax 
In function 
c 
In function 
Function fishers.alpha()
solves for alpha given
N and S, as per Fisher's table 9, p55.
Given N and S (or alpha), function
fisher.ecosystem()
generates a Fisherian ecosystem
with expected size N and expected species count S.
Robin K. S. Hankin
R. A. Fisher and A. S. Corbet and C. B. Williams 1943. “The relation between the number of species and the number of individuals in a random sample of an animal population”, Journal of Animal Ecology, volume 12, pp 42–58
1 2 3  fishers.alpha(N=100000,S=100)
#compare the Table value:
100000/10^3.95991

[1] 10.96717
[1] 10.96705
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