ordcomp: Ordination to Dissimilarity Comparison

In labdsv: Ordination and Multivariate Analysis for Ecology

Ordination to Dissimilarity Comparison

Description

Plots the distribution of pair-wise distances of all points in an ordination over the distances in the dissimilarity or distance matrix the ordination was calculated from. Prints the correlation between the two on the graph.

Usage

ordcomp(x,dis,dim,xlab="Computed Distance",
        ylab="Ordination Distance",title="",pch=1)

Arguments

x	an ordination object of class ‘dsvord’ from pca, pco, nmds, fso or ordiplot
dis	an object of class dist
dim	the number of dimensions in the ordination to use (default=all)
xlab	the X axis label for the graph
ylab	the Y axis label for the graph
title	a title for the plot
pch	the symbol to plot

Value

A plot is created on the current graphics device. Returns the (invisible) correlation.

Note

Ordinations are low dimensional representations of multidimensional spaces. This function attempts to portray how well the low dimensional solution approximates the full dimensional space.

Author(s)

David W. Roberts [e-mail]

Examples

data(bryceveg) # produces a vegetation data.frame
dis.bc <- dsvdis(bryceveg,'bray/curtis') # creates a Bray/Curtis 
                                         # dissimilarity matrix
pco.bc <- pco(dis.bc,2) # produces a two-dimensional Principal 
                        # Coordinates Ordination object
ordcomp(pco.bc,dis.bc)

labdsv documentation built on April 10, 2023, 5:08 p.m.