# phi

0th

Percentile

##### Hubbell's phi

Hubbell's phi: counts of species abundances

Keywords
math
##### Usage
phi(x,addnames=TRUE)
##### Arguments
x
Ecosystem vector; is coerced to class count
Boolean with default TRUE meaning to set the name of the $i$th element to the species with abundance $i$ if unique. Set to FALSE to suppress this, which is useful if the species names are long
##### Details

Function phi() coerces its argument to a count object and by default returns a named vector whose $i$th element is the number of species with $i$ individuals. The name of the $i$th element is the species with abundance $i$ if unique and empty otherwise. Function phi() is used by theta.prob().

##### Note

The code for setting the names is a dog's breakfast

##### References

S. P. Hubbell 2001. The Unified Neutral Theory of Biodiversity. Princeton University Press.

preston
data(butterflies)
phi(butterflies,add=FALSE)