MBI: rarity – R documentation

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rarity

Calculate rarity degrees (decided by the argument "percent") based on distributional ranges of species and abundance of species

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 <haydi@126.com>

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)

MBI

(M)ultiple-site (B)iodiversity (I)ndices Calculator

v1.0

GPL-2

Authors

Youhua Chen

Initial release

2012-10-17