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()
. Function no.of.spp()
returns the number of species in an
ecosystem object.
Function no.of.ind()
returns the number of individuals.
Function no.of.singletons()
returns the number of singletons.
Function singletons()
returns the names of the singletons.
Function simpson()
returns the Simpson index $D$: the
probability that two randomly sampled individuals belonging to
different species