sads (version 0.2.2)

octav-class: Class "octav" for frequencies in abundance octaves

Description

Data frame of frequencies of entities (usually species) in classes of logarithm of abundances at base 2 (Preston's octaves).

Usage

## S3 method for class 'octav':
lines(x, prop=FALSE, \dots)
## S3 method for class 'octav':
plot(x, prop=FALSE, x.oct=FALSE, par.axis=list(), ...)
## S3 method for class 'octav':
points(x, prop=FALSE, \dots)

Arguments

x

an object of class octav

prop

logical; if TRUE relative frequencies are returned.

x.oct

logical; if TRUE axis labels are octave numbers, if FALSE upper limit of abundance class are used as labels.

par.axis

list; further graphical parameters for the plot axes.

...

further parameters to be passed to lines, points or plot functions (except axes in plot, which are set by par.axis.

Objects from the Class

Objects can be created by calls of the form new("octav", ...), but most often by a call to octav or octavpred.

Extends

Class "data.frame", directly. Class "list", by class "data.frame", distance 2. Class "oldClass", by class "data.frame", distance 2. Class "vector", by class "data.frame", distance 3.

References

Magurran, A.E. 1989. Ecological diversity and its measurement. Princenton University Press. Preston, F.W. 1948. The commonness and rarity of species. Ecology 29: 254--283.

See Also

octav to get an object of the class from a vector of abundances; octavpred to get an octav object of predicted abundances from a theoretical distribution; man page of prestonfit in package vegan for a detailed account of Preston's octaves and an alternative way to get octaves and model fitting.

Examples

## Creates an octav object from an abundance vector
birds.oc <- octav(birds)
## default plot
plot(birds.oc)

## Using line and argument prop to superpose two data sets
## Fisher's et al moth data and Preston's bird data
moths.oc <- octav(moths)
plot(moths.oc, col=NULL, border=NA, prop=TRUE)
lines(moths.oc, prop=TRUE)
lines(birds.oc, prop=TRUE, col="red")