uMDS {NADA2}

Plot U-score Nonmetric Multidimensional Scaling of censored data

Description

Plots an NMDS of uscores output from the uscores or uscoresi functions.

Usage

uMDS(uscor, group = NULL, title = NULL, legend.pos = "bottomleft")

Arguments

uscor

A data frame of uscores or ranks of uscores produced by either the uscores(...) or uscoresi(...) functions

group

Optional grouping variable. Sites will be represented by different colored symbols for each group.

title

Optional title for the NMDS graph.

legend.pos

For when group is specified, the location of the legend on the graph showing the colors representing each group’s data. Default is “bottomleft”. Alternatives are “topright” and “centerleft”, etc.

Value

Prints an NMDS plot of censored data groupings based on U-scores #' @references Helsel, D.R., 2011. Statistics for Censored Environmental Data using Minitab and R, 2nd ed. John Wiley & Sons, USA, N.J.

Examples

data(PbHeron)

PbHeron.u <- uscores(PbHeron[,4:15])
uMDS(PbHeron.u)

# With group specific
uMDS(PbHeron.u,group=PbHeron$DosageGroup)