bvi: Biological Value Index

In bvindex/Rbvi: The Biological Value Index

Description

Calculates the Biological Value Index (Sanders, 1960) with modifications from Loya-Salina & Escofet (1990). It also provides a relative index, that allows for comparisons.

Usage

bvi(data, p = 0.95, other = T)

Arguments

data	an object of class matrix or data.frame. rownames must be samples and colnames must be species (or any other taxa).
p	The cutoff percentage to use, expressed relative to 1 (i.e. for a cutoff of 95 percent use p = 0.95)
other	a logical that indicates if species that do not contribute to p should be added together ina category "other". If FALSE, they are displayed individually.

Value

results An object of class data.frame containing a column with species name (spp), the scores for each species in each sample, a column (BVI) with the Biological Value Index, and a column (rBVI) with the Relative Biological Value Index. The results can be directly passed to bvi_plot to get a graphical representation.

Author(s)

Villasenor-Derbez, J.C.

See Also

bvi_plot

bvindex/Rbvi documentation built on May 13, 2019, 9:05 a.m.