hpie {benthos} | R Documentation |
Hurlbert's Probability of Interspecific Encounter (PIE)
Description
The probability that two individuals selected at random (without replacement) from a sample will belong to different species is given by (Hurlbert, 1971, p.579, Eq. 3):
where (Hurlbert, 1971, p.579, Eq. 4) is the
probability that two individuals selected at random (with
replacement) from a sample will belong to different species:
where is the number of individuals of the ith
species in the community,
is the total number of individuals in the
community,
, and
is the number of
species in the community.
Note that Hurlbert's PIE
hpie
is the complement of
simpson
.
Usage
hpie(.data = NULL, taxon, count)
hpie_(.data = NULL, taxon, count)
Arguments
.data |
data in a |
taxon |
name of column in |
count |
name of column in |
Value
A numeric vector with the probability of interspecific encounter (PIE).
Functions
-
hpie_()
: suitable for calling from a function (see package lazyeval).
References
Hurlbert, S.H., 1971. The Nonconcept of Species Diversity: A Critique and Alternative Parameters. Ecology 52:577-586.
See Also
Examples
hpie(
taxon = c("Euspira pulchella", "Nephtys cirrosa"),
count = c(6, 12)
)