Description Usage Format Source Examples
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).
1 |
A data frame with 62 observations on the following 6 variables.
pctscc
The response variable for proportion Englemann spruce.
pctfcc
The response variable for proportion subalpine fir.
pctlcc
The response variable for proportion lodgepole pine.
pctacc
The response variable for proportion aspen.
stand
The grouping variable specifying the 31 sample plots.
method
The blocking variable specifying whether the proportion was measured either for basal area (method = 2) or canopy cover (method = 1).
Cade, B.S. 1997. Comparison of tree basal area and canopy cover in habitat models: Subalpine forest. Journal of Wildlife Management 61, 326–335.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | 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)
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