abundtrans {labdsv}

Species Abundance Data Transformation

Description

Transforms species abundances according to an arbitrary specified vector

Usage

abundtrans(comm,code,value)

Arguments

comm

the original community data.frame

code

a vector containing the set of values appearing in the original data.frame

value

a vector containing the set of respective values to substitute

Details

Performs a respective substitution to transform specific values in an initial data.frame to other specified values.

Value

a data.frame of transformed abundance data

Note

Vegetation data are often collected in arbitrary abundance schemes (e.g. Braun-Blanquet, Domin, etc.) which have no direct algebraic transformation (e.g. log). This function transforms coded abundances to arbitrary importance values as specified.

Author(s)

David W. Roberts [e-mail]

See Also

decostand, wisconsin

Examples

data(bryceveg)
old <- c(0.2,0.5,1.0,2.0,3.0,4.0,5.0,6.0)
new <- c(0.2,0.5,3.0,15.0,37.5,62.5,85.0,97.5)
midpoint <- abundtrans(bryceveg,old,new)