Blossom (version 1.3)

agree2: Lodgepole pine basal area and canopy cover

Description

Analysis comparing measures of the proportion of basal area to the proportion of canopy cover of lodgepole pine (Pinus contorta) in 31 stands of subalpine forest in Colorado (Cade 1997).

Usage

data(agree2)

docType

data

source

Cade, B.S. 1997. Comparison of tree basal area and canopy cover in habitat models: Subalpine forest. Journal of Wildlife Management 61, 326--335.

Examples

str(agree2)

panel.cor <- function(x, y, digits = 2, prefix="", cex.cor, ...)
{
    usr <- par("usr"); on.exit(par(usr))
    par(usr = c(0, 1, 0, 1))
    r <- abs(cor(x, y,method = "spearman"))
    txt <- format(c(r, 0.123456789), digits = digits)[1]
    txt <- paste(prefix, txt, sep="")
    if(missing(cex.cor)) cex.cor <- 0.8/strwidth(txt)
    text(0.5, 0.5, txt, cex = cex.cor * 3*r)
}

pairs(agree2[,1:4],pch = 21,bg = c("red","grey")[agree2$method],cex = 1.5,
upper.panel = panel.cor)