dot-alpha: Calculate Alpha Irreplaceability

In proxirr: Alpha and Beta Proximity to Irreplaceability

Description

This function calculates Alpha Irreplaceability for a single feature.

Usage

.alpha(local, global, target, triage = FALSE, na.allow = FALSE)

Arguments

local	numeric - The feature's local representation at the site.
global	numeric - The feature's globally available representation.
target	numeric - The feature's target.
triage	logical - Should features with unachievable targets be ignored? Defaults to FALSE. If FALSE, these species will be always assigned an Alpha irreplaceability of 1 wherever they occur. If TRUE, these species will always be assigned an Alpha irreplaceabiltiy of 0.
na.allow	logical - Return NA if NA values are found in the inputs?

Details

If na.allow is TRUE and any of the required values is NA, returns NA.

If triage is set to TRUE, alpha irreplaceability is set to 0 if the target cannot be achieved (i.e., if the target is greater than the global value), and calculated normally otherwise.

Value

A number between 0 and 1.

Author(s)

Daniele Baisero, [e-mail]

References

doi: 10.1111/cobi.13806

Examples

.alpha(local=0,    global=100,  target=50)
.alpha(local=15,   global=100,  target=50)
.alpha(local=35,   global=100,  target=50)
.alpha(local=49.5, global=100,  target=50)
.alpha(local=55,   global=100,  target=50)
.alpha(local=100,  global=100,  target=0)
.alpha(local=5,    global=100,  target=110)
.alpha(local=5,    global=100,  target=110, triage=TRUE)
.alpha(local=32,   global=100,  target=NA, na.allow = TRUE)

proxirr documentation built on Nov. 14, 2021, 1:07 a.m.