rarity: Calculate rarity degrees (decided by the argument "percent")...

In MBI: (M)ultiple-site (B)iodiversity (I)ndices Calculator

Description

argument "percent" determines the rarity degree you want to calculate

Usage

rarity(data, percent = 0.3)

Arguments

data	rows of the data are sites, while columns of the data are species
percent	determines the rarity degree you want to calculate. default is .3, meaning that species have distributional sites less than 30

Details

This index is not beta diversity index, thus not being included in the batch.calculation() function

Value

return two percentage values, one denotes the range rarity percentage, another denotes the abundance rarity percentage

Author(s)

Youhua Chen <[e-mail]>

References

Chen Y (2012) MBI: an R package for calculating multiple-site biodiversity indices. Submitted.

Examples

test<-c(90,30,11,5,100,46,19,70,19,1,
        17,0,0,0,30,4,20,26,12,5,37,
		0,25,0,60,30,29,42,36,19,32,
		12,0,0,50,6,39,35,18,0,35,0,
		28,0,70,35,56,49,42,0,81,15,
		36,0,90,45,72,63,54,9,13,0,
		0,5,20,1,4,0,0,0,0,0,0,0,10,
		0,0,0,41,4,72,24,7,0,80,1,64,
		56,48,0,36,0,29,0,40,32,32,2,0,0)
test<-matrix(test,10,10)
rarity(test,percent=.3)

Example output

$rangerarity
[1] 0.1

$densityrarity
[1] 0.006451613

MBI documentation built on May 2, 2019, 4:19 a.m.